Update link for filing repo issues

The issues of the repo tool have been migrated from Monorail into the
Gerrit Tracker, hence the URL to file issues has changed.

Change-Id: Iad61ad5d9e9fd07941a26f504612e585fdfaaaab
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/4625205
Reviewed-by: Andy Perelson <ajp@google.com>
Commit-Queue: Andy Perelson <ajp@google.com>

repo_launcher

@@ -146,7 +146,7 @@ REPO_REV = os.environ.get('REPO_REV')
 if not REPO_REV:
   REPO_REV = 'stable'
 # URL to file bug reports for repo tool issues.
-BUG_URL = 'https://bugs.chromium.org/p/gerrit/issues/entry?template=Repo+tool+issue'
+BUG_URL = 'https://issues.gerritcodereview.com/issues/new?component=1370071'
 
 # increment this whenever we make important changes to this script
 VERSION = (2, 32)