ci: bump peter-evans/create-pull-request in the all-actions group (#28)

Bumps the all-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 7.0.11 to 8.0.0
- [Release notes](https://github.com/peter-evans/create-pull-request/releases)
- [Commits](peter-evans/create-pull-request@22a9089...98357b1)

---
updated-dependencies:
- dependency-name: peter-evans/create-pull-request
  dependency-version: 8.0.0
  dependency-type: direct:production
  update-type: version-update:semver-major
  dependency-group: all-actions
...

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

Author: dependabot[bot]

.github/workflows/diagrams.yml

@@ -40,7 +40,7 @@ jobs:
           tox -e md -- ${{ steps.getfile.outputs.files }}
 
       - name: Create Pull Request
-        uses: peter-evans/create-pull-request@22a9089034f40e5a961c8808d113e2c98fb63676  # v7.0.11
+        uses: peter-evans/create-pull-request@98357b18bf14b5342f975ff684046ec3b2a07725  # v8.0.0
         id: cpr
         with:
           branch: cpr/updated-diagrams