Upgrade lib event from 2.1.8 to 2.1.10 (#3290)

diff --git a/WORKSPACE b/WORKSPACE
index fdbe751..07ebcab 100644
--- a/WORKSPACE
+++ b/WORKSPACE
@@ -856,10 +856,10 @@
 
 http_archive(
     name = "org_libevent_libevent",
-    urls = ["https://github.com/libevent/libevent/releases/download/release-2.1.8-stable/libevent-2.1.8-stable.tar.gz"],
-    strip_prefix = "libevent-2.1.8-stable",
+    urls = ["https://github.com/libevent/libevent/releases/download/release-2.1.10-stable/libevent-2.1.10-stable.tar.gz"],
+    strip_prefix = "libevent-2.1.10-stable",
     build_file = "@//:third_party/libevent/libevent.BUILD",
-    sha256 = "965cc5a8bb46ce4199a47e9b2c9e1cae3b137e8356ffdad6d94d3b9069b71dc2",
+    sha256 = "e864af41a336bb11dab1a23f32993afe963c1f69618bd9292b89ecf6904845b0",
 )
 
 http_archive(