build(deps): bump peter-evans/create-pull-request from 4 to 8

Bumps [peter-evans/create-pull-request](https://github.com/peter-evans/create-pull-request) from 4 to 8.
- [Release notes](https://github.com/peter-evans/create-pull-request/releases)
- [Commits](peter-evans/create-pull-request@v4...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/copyright-update.yml

@@ -29,7 +29,7 @@ jobs:
           grep -rlZE "Copyright ([0-9]+)-$CURRENT_YEAR" . | xargs -0 sed -i -E "s/Copyright ([0-9]+)-$CURRENT_YEAR/Copyright \1-$NEW_YEAR/g"
       # Create PR
       - name: Create Pull Request
-        uses: peter-evans/create-pull-request@v4
+        uses: peter-evans/create-pull-request@v8
         with:
           token: ${{ secrets.GITHUB_TOKEN }}
           commit-message: 'Update copyright headers'