Fix typo in .github action

.github/workflows/push-pr_workflow.yml

@@ -15,7 +15,7 @@ jobs:
     - name: Check that CHANGELOG has been updated
       run: |
         # If this step fails, this means you haven't updated the CHANGELOG.md file with notes on your contribution.
-if git diff --name-only ${{ github.event.pull_request.base.sha }} ${{ github.sha }} | grep -q '^CHANGELOG.md$'; then
+        if git diff --name-only ${{ github.event.pull_request.base.sha }} ${{ github.sha }} | grep -q '^CHANGELOG.md$'; then
           echo "Thanks for helping keep our CHANGELOG up-to-date!"
         else
           echo "Please update the CHANGELOG.md file with notes on your contribution."