fix ci cassettes (Significant-Gravitas#4234)

Co-authored-by: Nicholas Tindle <[email protected]>

.github/workflows/add-cassettes.yml

@@ -22,15 +22,15 @@ jobs:
       - name: Reset branch
         run: |
           git checkout ${{ github.event.pull_request.base.ref }}
-          git reset --hard origin/cassette-diff-${{ github.event.pull_request.number }}
+          git reset --hard origin/cassette-diff-${{ github.event.pull_request.head.sha }}
 
       - name: Create PR
         id: create_pr
         uses: peter-evans/create-pull-request@v5
         with:
           commit-message: Update cassettes
           signoff: false
-          branch: cassette-diff-${{ github.event.pull_request.number }}
+          branch: cassette-diff-${{ github.event.pull_request.head.sha }}
           delete-branch: false
           title: "Update cassettes"
           body: "This PR updates the cassettes."

.github/workflows/ci.yml

@@ -95,11 +95,13 @@ jobs:
 
       - name: Stage new files and commit
         run: |
+          COMMIT_SHA=$(git rev-parse HEAD) # take the sha before committing the cassette
           git add tests
           git diff --cached --quiet && echo "No changes to commit" && exit 0
           git config user.email "[email protected]"
           git config user.name "GitHub Actions"
           git commit -m "Add new cassettes"
-          git checkout -b cassette-diff-${{ github.event.pull_request.number }}
+          
+          git checkout -b cassette-diff-${COMMIT_SHA}
           git remote add target https://${{ secrets.GITHUB_TOKEN }}@github.com/${{ github.event.pull_request.base.repo.full_name }}
-          git push -f target cassette-diff-${{ github.event.pull_request.number }}
+          git push -f target cassette-diff-${COMMIT_SHA}