Update Grpc.* dependencies to 2.30.0 (#986)

Author: JamesNK

build/dependencies.props

@@ -2,8 +2,8 @@
   <PropertyGroup>
     <BenchmarkDotNetPackageVersion>0.12.1</BenchmarkDotNetPackageVersion>
     <GoogleProtobufPackageVersion>3.12.2</GoogleProtobufPackageVersion>
-    <GrpcDotNetPackageVersion>2.29.0</GrpcDotNetPackageVersion>  <!-- Used by example projects -->
-    <GrpcPackageVersion>2.30.0-pre1</GrpcPackageVersion>
+    <GrpcDotNetPackageVersion>2.30.0</GrpcDotNetPackageVersion>  <!-- Used by example projects -->
+    <GrpcPackageVersion>2.30.0</GrpcPackageVersion>
     <MicrosoftAspNetCoreAppPackageVersion>3.1.3</MicrosoftAspNetCoreAppPackageVersion>
     <MicrosoftAspNetCoreBlazorPackageVersion>3.2.0</MicrosoftAspNetCoreBlazorPackageVersion>
     <MicrosoftBuildLocatorPackageVersion>1.2.2</MicrosoftBuildLocatorPackageVersion>