Bump commons-io version to 2.2

This dependency is not used in gerrit core. The only reason it's
included in WORKSPACE is because core replication plugin depends on it
and there is no way in Bazel to consume external dependency in core
plugin without defining this dependency in WORKSPACE file.

It turns out, that gitblit-plugin also depends on commons-io, but on the
newer version. Sync the versions to the same version used by gitblit.

Change-Id: Iae3545df95b23439d3c7fd385bfeae482d6d60ac
diff --git a/WORKSPACE b/WORKSPACE
index 3940736..e7db5ce 100644
--- a/WORKSPACE
+++ b/WORKSPACE
@@ -868,8 +868,8 @@
 
 maven_jar(
     name = "commons-io",
-    artifact = "commons-io:commons-io:1.4",
-    sha1 = "a8762d07e76cfde2395257a5da47ba7c1dbd3dce",
+    artifact = "commons-io:commons-io:2.2",
+    sha1 = "83b5b8a7ba1c08f9e8c8ff2373724e33d3c1e22a",
 )
 
 maven_jar(