build: run dotnet sample on ubuntu

.github/workflows/samples.yaml

@@ -83,14 +83,12 @@ jobs:
           bundle install
           bundle exec rake run
   dotnet-samples:
-    runs-on: windows-latest
+    runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
       - uses: actions/setup-dotnet@v4
         with:
           dotnet-version: '6.0.x'
-      - name: Switch Docker daemon
-        run: $Env:ProgramFiles\Docker\Docker\DockerCli.exe -SwitchDaemon
       - name: Run npgsql Sample tests
         working-directory: ./samples/dotnet/npgsql-sample
         run: dotnet run Program.cs