Update gems

* Update rexml for CVE-2024-43398 (this closes #7)
* Lock some dependency versions to work with ruby 2.7 on ASF build
  servers
diff --git a/Gemfile b/Gemfile
index 264e97d..227c907 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,3 +1,7 @@
 ruby '>=2.7'
 source 'https://rubygems.org'
 gem 'jekyll', '>= 4.2.0'
+gem 'jekyll-redirect-from', '>= 0.16.0'
+
+gem "webrick", "~> 1.7"
+gem "google-protobuf", "3.25.3"
diff --git a/Gemfile.lock b/Gemfile.lock
index a557792..32593f2 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -3,9 +3,8 @@
   specs:
     addressable (2.8.7)
       public_suffix (>= 2.0.2, < 7.0)
-    bigdecimal (3.1.8)
     colorator (1.1.0)
-    concurrent-ruby (1.3.3)
+    concurrent-ruby (1.3.4)
     em-websocket (0.5.3)
       eventmachine (>= 0.12.9)
       http_parser.rb (~> 0)
@@ -22,28 +21,16 @@
     ffi (1.17.0-x86_64-linux-gnu)
     ffi (1.17.0-x86_64-linux-musl)
     forwardable-extended (2.6.0)
-    google-protobuf (4.27.2)
-      bigdecimal
-      rake (>= 13)
-    google-protobuf (4.27.2-aarch64-linux)
-      bigdecimal
-      rake (>= 13)
-    google-protobuf (4.27.2-arm64-darwin)
-      bigdecimal
-      rake (>= 13)
-    google-protobuf (4.27.2-x86-linux)
-      bigdecimal
-      rake (>= 13)
-    google-protobuf (4.27.2-x86_64-darwin)
-      bigdecimal
-      rake (>= 13)
-    google-protobuf (4.27.2-x86_64-linux)
-      bigdecimal
-      rake (>= 13)
+    google-protobuf (3.25.3)
+    google-protobuf (3.25.3-aarch64-linux)
+    google-protobuf (3.25.3-arm64-darwin)
+    google-protobuf (3.25.3-x86-linux)
+    google-protobuf (3.25.3-x86_64-darwin)
+    google-protobuf (3.25.3-x86_64-linux)
     http_parser.rb (0.8.0)
-    i18n (1.14.5)
+    i18n (1.14.6)
       concurrent-ruby (~> 1.0)
-    jekyll (4.3.3)
+    jekyll (4.3.4)
       addressable (~> 2.4)
       colorator (~> 1.0)
       em-websocket (~> 0.5)
@@ -59,6 +46,8 @@
       safe_yaml (~> 1.0)
       terminal-table (>= 1.8, < 4.0)
       webrick (~> 1.7)
+    jekyll-redirect-from (0.16.0)
+      jekyll (>= 3.3, < 5.0)
     jekyll-sass-converter (3.0.0)
       sass-embedded (~> 1.54)
     jekyll-watch (2.2.1)
@@ -75,63 +64,57 @@
     pathutil (0.16.2)
       forwardable-extended (~> 2.6)
     public_suffix (6.0.1)
-    rake (13.2.1)
     rb-fsevent (0.11.2)
     rb-inotify (0.11.1)
       ffi (~> 1.0)
-    rexml (3.3.3)
-      strscan
-    rouge (4.3.0)
+    rexml (3.3.7)
+    rouge (4.4.0)
     safe_yaml (1.0.5)
-    sass-embedded (1.77.8)
-      google-protobuf (~> 4.26)
-      rake (>= 13)
-    sass-embedded (1.77.8-aarch64-linux-android)
-      google-protobuf (~> 4.26)
-    sass-embedded (1.77.8-aarch64-linux-gnu)
-      google-protobuf (~> 4.26)
-    sass-embedded (1.77.8-aarch64-linux-musl)
-      google-protobuf (~> 4.26)
-    sass-embedded (1.77.8-aarch64-mingw-ucrt)
-      google-protobuf (~> 4.26)
-    sass-embedded (1.77.8-arm-linux-androideabi)
-      google-protobuf (~> 4.26)
-    sass-embedded (1.77.8-arm-linux-gnueabihf)
-      google-protobuf (~> 4.26)
-    sass-embedded (1.77.8-arm-linux-musleabihf)
-      google-protobuf (~> 4.26)
-    sass-embedded (1.77.8-arm64-darwin)
-      google-protobuf (~> 4.26)
-    sass-embedded (1.77.8-riscv64-linux-android)
-      google-protobuf (~> 4.26)
-    sass-embedded (1.77.8-riscv64-linux-gnu)
-      google-protobuf (~> 4.26)
-    sass-embedded (1.77.8-riscv64-linux-musl)
-      google-protobuf (~> 4.26)
-    sass-embedded (1.77.8-x86-cygwin)
-      google-protobuf (~> 4.26)
-    sass-embedded (1.77.8-x86-linux-android)
-      google-protobuf (~> 4.26)
-    sass-embedded (1.77.8-x86-linux-gnu)
-      google-protobuf (~> 4.26)
-    sass-embedded (1.77.8-x86-linux-musl)
-      google-protobuf (~> 4.26)
-    sass-embedded (1.77.8-x86-mingw-ucrt)
-      google-protobuf (~> 4.26)
-    sass-embedded (1.77.8-x86_64-cygwin)
-      google-protobuf (~> 4.26)
-    sass-embedded (1.77.8-x86_64-darwin)
-      google-protobuf (~> 4.26)
-    sass-embedded (1.77.8-x86_64-linux-android)
-      google-protobuf (~> 4.26)
-    sass-embedded (1.77.8-x86_64-linux-gnu)
-      google-protobuf (~> 4.26)
-    sass-embedded (1.77.8-x86_64-linux-musl)
-      google-protobuf (~> 4.26)
-    strscan (3.1.0)
+    sass-embedded (1.77.5-aarch64-linux-android)
+      google-protobuf (>= 3.25, < 5.0)
+    sass-embedded (1.77.5-aarch64-linux-gnu)
+      google-protobuf (>= 3.25, < 5.0)
+    sass-embedded (1.77.5-aarch64-linux-musl)
+      google-protobuf (>= 3.25, < 5.0)
+    sass-embedded (1.77.5-aarch64-mingw-ucrt)
+      google-protobuf (>= 3.25, < 5.0)
+    sass-embedded (1.77.5-arm-linux-androideabi)
+      google-protobuf (>= 3.25, < 5.0)
+    sass-embedded (1.77.5-arm-linux-gnueabihf)
+      google-protobuf (>= 3.25, < 5.0)
+    sass-embedded (1.77.5-arm-linux-musleabihf)
+      google-protobuf (>= 3.25, < 5.0)
+    sass-embedded (1.77.5-arm64-darwin)
+      google-protobuf (>= 3.25, < 5.0)
+    sass-embedded (1.77.5-riscv64-linux-android)
+      google-protobuf (>= 3.25, < 5.0)
+    sass-embedded (1.77.5-riscv64-linux-gnu)
+      google-protobuf (>= 3.25, < 5.0)
+    sass-embedded (1.77.5-riscv64-linux-musl)
+      google-protobuf (>= 3.25, < 5.0)
+    sass-embedded (1.77.5-x86-cygwin)
+      google-protobuf (>= 3.25, < 5.0)
+    sass-embedded (1.77.5-x86-linux-android)
+      google-protobuf (>= 3.25, < 5.0)
+    sass-embedded (1.77.5-x86-linux-gnu)
+      google-protobuf (>= 3.25, < 5.0)
+    sass-embedded (1.77.5-x86-linux-musl)
+      google-protobuf (>= 3.25, < 5.0)
+    sass-embedded (1.77.5-x86-mingw-ucrt)
+      google-protobuf (>= 3.25, < 5.0)
+    sass-embedded (1.77.5-x86_64-cygwin)
+      google-protobuf (>= 3.25, < 5.0)
+    sass-embedded (1.77.5-x86_64-darwin)
+      google-protobuf (>= 3.25, < 5.0)
+    sass-embedded (1.77.5-x86_64-linux-android)
+      google-protobuf (>= 3.25, < 5.0)
+    sass-embedded (1.77.5-x86_64-linux-gnu)
+      google-protobuf (>= 3.25, < 5.0)
+    sass-embedded (1.77.5-x86_64-linux-musl)
+      google-protobuf (>= 3.25, < 5.0)
     terminal-table (3.0.2)
       unicode-display_width (>= 1.1.1, < 3)
-    unicode-display_width (2.5.0)
+    unicode-display_width (2.6.0)
     webrick (1.8.1)
 
 PLATFORMS
@@ -149,7 +132,6 @@
   riscv64-linux-android
   riscv64-linux-gnu
   riscv64-linux-musl
-  ruby
   x86-cygwin
   x86-linux
   x86-linux-android
@@ -163,7 +145,10 @@
   x86_64-linux-musl
 
 DEPENDENCIES
+  google-protobuf (= 3.25.3)
   jekyll (>= 4.2.0)
+  jekyll-redirect-from (>= 0.16.0)
+  webrick (~> 1.7)
 
 RUBY VERSION
    ruby 3.3.4p94