lint: Update Gh Actions for gitlint.

Author: LoopThrough-i-j

.github/workflows/zulip-tests.yml

@@ -24,6 +24,8 @@ jobs:
           sudo apt-get update
           sudo apt-get install virtualenv
           tools/provision --force
+          git remote add upstream https://github.com/zulip/python-zulip-api.git
+          git fetch upstream
 
       - name: Running Test-Suite
         run: |