Use HTTPS instead of HTTP to resolve dependencies

This fixes a security vulnerability in this project where the `pom.xml`
files were configuring Maven to resolve dependencies over HTTP instead of
HTTPS.

Signed-off-by: Jonathan Leitschuh <Jonathan.Leitschuh@gmail.com>
diff --git a/api/pom.xml b/api/pom.xml
index 2a1dbde..f4eb59d 100644
--- a/api/pom.xml
+++ b/api/pom.xml
@@ -483,7 +483,7 @@
                 <pluginRepository>
                     <id>java.net.repo</id>
                     <name>java.net repository</name>
-                    <url>http://download.java.net/maven/2/</url>
+                    <url>https://download.java.net/maven/2/</url>
                 </pluginRepository>
             </pluginRepositories>
         </profile>
diff --git a/parent/pom.xml b/parent/pom.xml
index ee450a2..aecec5c 100644
--- a/parent/pom.xml
+++ b/parent/pom.xml
@@ -513,7 +513,7 @@
         <pluginRepository>
             <id>apache.snapshots.plugin</id>
             <name>Apache Snapshot Repository</name>
-            <url>http://repository.apache.org/snapshots</url>
+            <url>https://repository.apache.org/snapshots</url>
             <releases>
                 <enabled>false</enabled>
             </releases>
diff --git a/pom.xml b/pom.xml
index f7c8917..6db029b 100644
--- a/pom.xml
+++ b/pom.xml
@@ -169,7 +169,7 @@
         <pluginRepository>
             <id>apache.snapshots.plugin</id>
             <name>Apache Snapshot Repository</name>
-            <url>http://repository.apache.org/snapshots</url>
+            <url>https://repository.apache.org/snapshots</url>
             <releases>
                 <enabled>false</enabled>
             </releases>