fix(transformer): find last modified date form commit on submodule (#1831)

dralagen

2025-03-19 bcde2abcb20ad02a0c3f1430b9d620ee60e6cb63

 .github/workflows/ci.yaml

@@ -45,7 +45,7 @@
        run: npm test

      - name: Ensure Quartz builds, check bundle info
        run: npx quartz build --bundleInfo
        run: npx quartz build --bundleInfo -d docs

  publish-tag:
    if: ${{ github.repository == 'jackyzha0/quartz' && github.ref == 'refs/heads/v4' }}