Bump peter-evans/create-pull-request from 7 to 8 (#63)

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
...

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Author: dependabot[bot]

.github/workflows/diff-spec.yml

@@ -26,4 +26,4 @@ jobs:
               run: PHP_CS_FIXER_IGNORE_ENV=1 ./vendor/bin/php-cs-fixer fix
 
             - name: Create Pull Request
-              uses: peter-evans/create-pull-request@v7
+              uses: peter-evans/create-pull-request@v8