ci:Use 'dotnet test' instead of vstest-action as workaround (#334)

Author: kailash-b

.github/workflows/build.yml

@@ -37,8 +37,4 @@ jobs:
         run: msbuild Auth0.OidcClient.All.sln -t:rebuild -verbosity:diag -property:Configuration=Release
 
       - name: Tests
-        uses: microsoft/[email protected]
-        with:
-          testAssembly: '**\bin\**\*UnitTests.dll'
-          searchFolder: '.\'
-          runInParallel: false
+        run: dotnet test **\bin\**\*UnitTests.dll