Bump actions/download-artifact from 2 to 4.1.7 in /.github/workflows (#278)

Author: dependabot[bot]

.github/workflows/ci.yml

@@ -102,7 +102,7 @@ jobs:
         dotnet-version: |
           8.0.x
         include-prerelease: true
-    - uses: actions/download-artifact@v2
+    - uses: actions/download-artifact@v4.1.7
       with:
         name: artifacts
         path: ./artifacts