Set Gerrit 3.12.2 as latest version

Change-Id: I216fcfa22d5fbd224acecfd62789fe099255d414
diff --git a/gerrit.rb b/gerrit.rb
index 44ef2a0..1a603d6 100644
--- a/gerrit.rb
+++ b/gerrit.rb
@@ -10,8 +10,8 @@
 
   set_common_dependencies
 
-  version "3.12.1"
-  sha256 "a106a8bd1dbbff0d119cb53a7e110674cd1106ab6675d3a51584bddb2c537041"
+  version "3.12.2"
+  sha256 "18b3bb9e6dd20992e1ff3a83964551ae06843bc45f2539d65a63161ec64f5485"
   url generate_url(version)
 
 end