Bump peter-evans/create-pull-request from 7 to 8

Bumps [peter-evans/create-pull-request](https://github.com/peter-evans/create-pull-request) from 7 to 8.
- [Release notes](https://github.com/peter-evans/create-pull-request/releases)
- [Commits](peter-evans/create-pull-request@v7...v8)

---
updated-dependencies:
- dependency-name: peter-evans/create-pull-request
  dependency-version: '8'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

.github/workflows/cron.yaml

@@ -24,7 +24,7 @@ jobs:
     # this action seems to have significant usage, so it should be stable
     # can always re-implement with `git status --porcelain`, etc. if necessary
     - name: Create Pull Request
-      uses: peter-evans/create-pull-request@v7
+      uses: peter-evans/create-pull-request@v8
       with:
         title: 'Update vendored schemas'
         commit-message: '[vendor-schemas] automated update'