chore(deps): update codecov/codecov-action action to v6

Author: renovate[bot]

.github/workflows/dotnet.yml

@@ -41,4 +41,4 @@ jobs:
       run: dotnet test --no-build --verbosity normal --collect:"XPlat Code Coverage"
 
     - name: Upload Code Coverage
-      uses: codecov/codecov-action@v5
+      uses: codecov/codecov-action@v6