Bump actions/download-artifact from 6 to 7 (#15)

Bumps [actions/download-artifact](https://github.com/actions/download-artifact) from 6 to 7.
- [Release notes](https://github.com/actions/download-artifact/releases)
- [Commits](actions/download-artifact@v6...v7)

---
updated-dependencies:
- dependency-name: actions/download-artifact
  dependency-version: '7'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/codeql-qlt-unit-tests.yml

@@ -177,7 +177,7 @@ jobs:
           install-ql-packs: false
 
       - name: Download CodeQL unit test results
-        uses: actions/download-artifact@v6
+        uses: actions/download-artifact@v7
         with:
           pattern: qlt-test-results-*
           path: test-results/