Devops: Bump peter-evans/create-pull-request (aiidateam#6576)

Bumps the gha-dependencies 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: gha-dependencies
...

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

.github/workflows/test-install.yml

@@ -306,7 +306,7 @@ jobs:
       if: steps.check_reqs.outcome == 'Failure'  # only run if requirements/ are inconsistent
       id: create_update_requirements_pr
       continue-on-error: true
-      uses: peter-evans/create-pull-request@v6
+      uses: peter-evans/create-pull-request@v7
       with:
         branch: update-requirements
         commit-message: Automated update of requirements/ files.