Update peter-evans/create-pull-request action to v8

Author: renovate[bot]

.github/workflows/build.yaml

@@ -30,7 +30,7 @@ jobs:
       - name: Create Pull Request
         id: cpr
         if: github.event_name == 'pull_request'
-        uses: peter-evans/create-pull-request@v6
+        uses: peter-evans/create-pull-request@v8
         with:
           commit-message: Update generated files
           base: ${{ github.head_ref }}