Bump peter-evans/create-pull-request in /.github/workflows

Bumps [peter-evans/create-pull-request](https://github.com/peter-evans/create-pull-request) from 7.0.8 to 8.1.1.
- [Release notes](https://github.com/peter-evans/create-pull-request/releases)
- [Commits](https://github.com/peter-evans/create-pull-request/compare/271a8d0340265f705b14b6d32b9829c1cb33d45e...5f6978faf089d4d20b00c7766989d076bb2fc7f1)

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

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