Update actions/setup-dotnet action to v3.0.3 (#24)

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

.github/workflows/dotnetcore.yml

@@ -10,7 +10,7 @@ jobs:
     steps:
     - uses: actions/checkout@v3
     - name: Setup .NET Core SDK
-      uses: actions/setup-dotnet@v3.0.1
+      uses: actions/setup-dotnet@v3.0.3
     - name: Build with dotnet
       run: cd src && dotnet build --configuration Release
     - name: Unit test with coverage report