Update actions/download-artifact action to v5 (#386)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/workflows/unit-test.yml

@@ -67,7 +67,7 @@ jobs:
           fetch-depth: 0
 
       - name: Download coverage report
-        uses: actions/download-artifact@v4
+        uses: actions/download-artifact@v5
         with:
           name: coverage_report
           path: .qodana/code-coverage