Bump actions/download-artifact from 5 to 6

Bumps [actions/download-artifact](https://github.com/actions/download-artifact) from 5 to 6.
- [Release notes](https://github.com/actions/download-artifact/releases)
- [Commits](actions/download-artifact@v5...v6)

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

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

.github/workflows/cross-platform-testing-build-from-source.yml

@@ -87,7 +87,7 @@ jobs:
           java-version: ${{ matrix.java-version }}
           distribution: ${{ matrix.os == 'macos-14' && 'zulu' || 'temurin' }} # No Temurin JDK 8 distribution for aarch64
       - name: Download built script artifacts
-        uses: actions/download-artifact@v5
+        uses: actions/download-artifact@v6
         with:
           name: artifacts
       - name: Extract build validation scripts