Merge pull request matplotlib#22193 from meeseeksmachine/auto-backport-of-pr-22190-on-v3.5.1-doc

Backport PR matplotlib#22190 on branch v3.5.1-doc (DOC: Fix upstream URL for merge in CircleCI)

Author: QuLogic

.circleci/config.yml

@@ -28,7 +28,7 @@ commands:
           name: Merge with upstream
           command: |
             if ! git remote -v | grep upstream; then
-              git remote add upstream git://github.com/matplotlib/matplotlib.git
+              git remote add upstream https://github.com/matplotlib/matplotlib.git
             fi
             git fetch upstream
             if [[ "$CIRCLE_BRANCH" != "master" ]] && \