[GitHubEnterprise-3.0] Update peter-evans/create-pull-request action to v7.0.8

Author: renovate[bot]

.github/workflows/generate-GitHubEnterprise-3.0.yaml

@@ -64,7 +64,7 @@ jobs:
         run: |
           make generate-client GitHubEnterprise-3.0
       - name: Create Pull Request
-        uses: peter-evans/create-pull-request@v7
+        uses: peter-evans/create-pull-request@271a8d0340265f705b14b6d32b9829c1cb33d45e # v7.0.8
         with:
           branch: "GitHubEnterprise-3.0/from-${{ steps.look-current-up-spec-version.outputs.result }}-${{ steps.spec-hash.outputs.current }}-from-${{ steps.look-previous-up-spec-version.outputs.result }}-${{ steps.spec-hash.outputs.current }}"
           token: ${{ secrets.SUBSPLIT_GITHUB_TOKEN }}