build(deps): bump actions/upload-artifact from 5 to 6 (#2331)

Bumps [actions/upload-artifact](https://github.com/actions/upload-artifact) from 5 to 6.
- [Release notes](https://github.com/actions/upload-artifact/releases)
- [Commits](https://github.com/actions/upload-artifact/compare/v5...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>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

.github/workflows/ci.yaml

@@ -69,7 +69,7 @@ jobs:
       - name: Archive built binaries
         if: matrix.helm-version == 'v4.0.1'
         run: tar -cvf built-binaries.tar helmfile diff-yamls dyff
-      - uses: actions/upload-artifact@v5
+      - uses: actions/upload-artifact@v6
         if: matrix.helm-version == 'v4.0.1'
         with:
           name: built-binaries-${{ github.run_id }}