Build go-import plugin on stable-3.3 branch

Change-Id: I30391695808bf255d78d0d9b5045379514adc37d
diff --git a/jenkins/gerrit-bazel-plugin-go-import.yaml b/jenkins/gerrit-bazel-plugin-go-import.yaml
index 2960dd5..3154956 100644
--- a/jenkins/gerrit-bazel-plugin-go-import.yaml
+++ b/jenkins/gerrit-bazel-plugin-go-import.yaml
@@ -8,5 +8,6 @@
             - master
       - 'plugin-{name}-bazel-{branch}':
           branch:
+            - stable-3.3
             - stable-3.2
             - stable-2.16