⬆️ Bump actions/download-artifact from 4 to 5

Bumps [actions/download-artifact](https://github.com/actions/download-artifact) from 4 to 5.
- [Release notes](https://github.com/actions/download-artifact/releases)
- [Commits](actions/download-artifact@v4...v5)

---
updated-dependencies:
- dependency-name: actions/download-artifact
  dependency-version: '5'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

.github/workflows/build-test.yml

@@ -90,7 +90,7 @@ jobs:
         run: echo "IMAGE_TAG=${BRANCH}_terraform-${{ matrix.tf_version }}_azcli-${{ matrix.azcli_version }}" >> $GITHUB_ENV
 
       - name: Download image artifact
-        uses: actions/download-artifact@v4
+        uses: actions/download-artifact@v5
         with:
           name: ${{ env.IMAGE_NAME }}_${{ env.IMAGE_TAG }}