ci: add github-actions[bot] git identity

Author: danielroe

.github/workflows/release-tag.yml

@@ -77,6 +77,8 @@ jobs:
         env:
           VERSION: ${{ steps.version.outputs.next }}
         run: |
+          git config user.name "github-actions[bot]"
+          git config user.email "41898282+github-actions[bot]@users.noreply.github.com"
           git tag -a "$VERSION" -m "Release $VERSION"
           git push origin "$VERSION"