Use newer version of create-pull-request action

This commit is an attempt to fix the update-codeql.yml actions
workflow by upgrading to a newer (@v8) version of the
create-pull-request action, where the previously used version had
a known compatibility issue with newer actions/checkout versions.

Author: data-douser

.github/workflows/update-codeql.yml

@@ -95,7 +95,7 @@ jobs:
 
         - name: Create Pull Request
           if: steps.check-version.outputs.update_needed == 'true'
-          uses: peter-evans/create-pull-request@271a8d0340265f705b14b6d32b9829c1cb33d45e # v7.0.8
+          uses: peter-evans/create-pull-request@v8
           with:
             title: "Upgrade CodeQL CLI dependency to ${{ steps.check-version.outputs.latest_version_tag }}"
             body: |