Fix typo in PR titles generated by github-actions bot (#16003)

(cherry picked from commit 2dcebc2)

Author: awaelchli

.github/workflows/legacy-checkpoints.yml

@@ -132,7 +132,7 @@ jobs:
     - name: Create Pull Request
       uses: peter-evans/create-pull-request@v4
       with:
-        title: Adding test for legacy checkpiont created with ${{ needs.create-legacy-ckpts.outputs.pl-version }}
+        title: Adding test for legacy checkpoint created with ${{ needs.create-legacy-ckpts.outputs.pl-version }}
         delete-branch: true
         labels: |
           tests