Bump peter-evans/create-pull-request from 8.1.0 to 8.1.1 (#1635)

Bumps [peter-evans/create-pull-request](https://github.com/peter-evans/create-pull-request) from 8.1.0 to 8.1.1.
- [Release notes](https://github.com/peter-evans/create-pull-request/releases)
- [Commits](peter-evans/create-pull-request@c0f553f...5f6978f)

---
updated-dependencies:
- dependency-name: peter-evans/create-pull-request
  dependency-version: 8.1.1
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/update-on-merge.yaml

@@ -56,7 +56,7 @@ jobs:
       shell: bash
 
     - name: Create pull request
-      uses: peter-evans/create-pull-request@c0f553fe549906ede9cf27b5156039d195d2ece0
+      uses: peter-evans/create-pull-request@5f6978faf089d4d20b00c7766989d076bb2fc7f1
       if: ${{ steps.renumber-sections.outputs.status }} == 'success' && ${{ steps.update-grammar.outputs.status }} == 'success'
       with:
         title: "Automated Section renumber and grammar extraction"