Bump actions/upload-artifact from 4 to 6

Bumps [actions/upload-artifact](https://github.com/actions/upload-artifact) from 4 to 6.
- [Release notes](https://github.com/actions/upload-artifact/releases)
- [Commits](actions/upload-artifact@v4...v6)

---
updated-dependencies:
- dependency-name: actions/upload-artifact
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

.github/workflows/build.yml

@@ -154,7 +154,7 @@ jobs:
       # https://docs.github.com/en/actions/guides/storing-workflow-data-as-artifacts#about-workflow-artifacts
       # https://github.com/marketplace/actions/upload-a-build-artifact
       - name: 📤 Upload deployment folder as a build artifact
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v6
         with:
           name: ${{env.ARTIFACT_PACKAGE}}
           path: ./release/