[.github/workflows]: Bump peter-evans/create-pull-request

Bumps the github-actions group with 1 update: [peter-evans/create-pull-request](https://github.com/peter-evans/create-pull-request).


Updates `peter-evans/create-pull-request` from 6 to 7
- [Release notes](https://github.com/peter-evans/create-pull-request/releases)
- [Commits](peter-evans/create-pull-request@v6...v7)

---
updated-dependencies:
- dependency-name: peter-evans/create-pull-request
  dependency-type: direct:production
  update-type: version-update:semver-major
  dependency-group: github-actions
...

Signed-off-by: dependabot[bot] <[email protected]>

.github/workflows/nightly.yml

@@ -54,7 +54,7 @@ jobs:
           echo "Changes?: ${{ steps.changes.outputs.changed }}"
       - name: Create PR
         if: steps.changes.outputs.changed == 1
-        uses: peter-evans/create-pull-request@v6
+        uses: peter-evans/create-pull-request@v7
         with:
           commit-message: Update test timings file
           branch: maint/update-test-timings