Bump Gerrit to v3.4.5

Change-Id: Ia4a4d898e80039a6ce86c01542042c236a7bff00
diff --git a/src/test/docker/gerrit/Dockerfile b/src/test/docker/gerrit/Dockerfile
index 6834f57..602c04d 100644
--- a/src/test/docker/gerrit/Dockerfile
+++ b/src/test/docker/gerrit/Dockerfile
@@ -1,4 +1,4 @@
-FROM gerritcodereview/gerrit:3.4.1
+FROM gerritcodereview/gerrit:3.4.5
 
 ENV GERRIT_BRANCH=stable-3.4