chore(deps): bump actions/upload-artifact from 3 to 4 (#65)

Bumps [actions/upload-artifact](https://github.com/actions/upload-artifact) from 3 to 4.
- [Release notes](https://github.com/actions/upload-artifact/releases)
- [Commits](actions/upload-artifact@v3...v4)

---
updated-dependencies:
- dependency-name: actions/upload-artifact
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

.github/workflows/main.yml

@@ -26,7 +26,7 @@ jobs:
           if [ -n "$(git status --porcelain)" ]; then echo 'workspace is dirty after rebuilding' ; git status ; git diff ; exit 1 ; fi
 
       - name: Upload build folder
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         if: github.ref == 'refs/heads/main'
         with:
           name: site