chore(deps): update actions/upload-artifact action to v7

Author: renovate[bot]

.github/workflows/dotnet-core.yml

@@ -36,7 +36,7 @@ jobs:
       if: always()
       with:
         report_paths: Test/TestResults/TestResults.xml
-    - uses: actions/upload-artifact@v6
+    - uses: actions/upload-artifact@v7
       if: failure()
       with:
         name: artifacts