Fetch uploadvalidator for the stable-3.0 build

The uploadvalidator plugin is built on its own stable-3.0
branch and should be fetched from there for including
in the binary package.

Change-Id: Id0d139aa1a76cc371f7b7b933eca00b44c8661d5
diff --git a/fpm/Makefile b/fpm/Makefile
index add4605..b630b63 100644
--- a/fpm/Makefile
+++ b/fpm/Makefile
@@ -25,7 +25,7 @@
   plugin-out-of-the-box-bazel-master-stable-3.0/lastSuccessfulBuild/artifact/bazel-bin/plugins/out-of-the-box/out-of-the-box.jar
 PLUGINS_JOBS= \
   plugin-avatars-gravatar-bazel-master-stable-3.0/lastSuccessfulBuild/artifact/bazel-bin/plugins/avatars-gravatar/avatars-gravatar.jar \
-  plugin-uploadvalidator-bazel-master-stable-3.0/lastSuccessfulBuild/artifact/bazel-bin/plugins/uploadvalidator/uploadvalidator.jar
+  plugin-uploadvalidator-bazel-stable-3.0/lastSuccessfulBuild/artifact/bazel-bin/plugins/uploadvalidator/uploadvalidator.jar
 
 RPM_OUT=$(OUT)/gerrit-$(VERSION)-$(RELEASE).$(BUILD_ARCH).rpm
 DEB_OUT=$(OUT)/gerrit-$(VERSION)-$(RELEASE).$(BUILD_ARCH).deb