Update Grpc.Core.Api to 2.23 (#465)

Author: JamesNK

build/dependencies.props

@@ -4,7 +4,7 @@
     <CommandLineParserPackageVersion>2.3.0</CommandLineParserPackageVersion>
     <ConfigureAwaitCheckerAnalyzerPackageVersion>3.0.0</ConfigureAwaitCheckerAnalyzerPackageVersion>
     <GoogleProtobufPackageVersion>3.9.1</GoogleProtobufPackageVersion>
-    <GrpcPackageVersion>2.23.0-pre1</GrpcPackageVersion>
+    <GrpcPackageVersion>2.23.0</GrpcPackageVersion>
     <MicrosoftAspNetCorePackageVersion>3.0.0-preview8.19405.7</MicrosoftAspNetCorePackageVersion>
     <MicrosoftBuildLocatorPackageVersion>1.2.2</MicrosoftBuildLocatorPackageVersion>
     <MicrosoftBuildPackageVersion>16.0.461</MicrosoftBuildPackageVersion>

test/FunctionalTests/Client/EventSourceTests.cs

@@ -197,7 +197,7 @@ async Task<HelloReply> UnaryDeadlineExceeded(HelloRequest request, ServerCallCon
 
             var client = TestClientFactory.Create(Channel, method);
 
-            var call = client.UnaryCall(new HelloRequest(), new CallOptions(deadline: DateTime.UtcNow.AddMilliseconds(200)));
+            var call = client.UnaryCall(new HelloRequest(), new CallOptions(deadline: DateTime.UtcNow.AddMilliseconds(500)));
 
             // Assert - Call in progress
             await AssertCounters(serverEventListener, new Dictionary<string, long>