Bump version to 2.31.0 (#1018)

* Bump version to 2.31.0

* Bump Grpc.Core dependency to 2.31.0

Author: jtattermusch

build/dependencies.props

@@ -3,7 +3,7 @@
     <BenchmarkDotNetPackageVersion>0.12.1</BenchmarkDotNetPackageVersion>
     <GoogleProtobufPackageVersion>3.12.2</GoogleProtobufPackageVersion>
     <GrpcDotNetPackageVersion>2.30.0</GrpcDotNetPackageVersion>  <!-- Used by example projects -->
-    <GrpcPackageVersion>2.31.0-pre2</GrpcPackageVersion>
+    <GrpcPackageVersion>2.31.0</GrpcPackageVersion>
     <MicrosoftAspNetCoreAppPackageVersion>3.1.3</MicrosoftAspNetCoreAppPackageVersion>
     <MicrosoftAspNetCoreBlazorPackageVersion>3.2.0</MicrosoftAspNetCoreBlazorPackageVersion>
     <MicrosoftBuildLocatorPackageVersion>1.2.2</MicrosoftBuildLocatorPackageVersion>

build/version.props

@@ -2,7 +2,7 @@
   <PropertyGroup>
 
     <!-- package version of grpc-dotnet -->
-    <GrpcDotnetVersion>2.31.0-pre2</GrpcDotnetVersion>
+    <GrpcDotnetVersion>2.31.0</GrpcDotnetVersion>
 
     <!-- assembly version of grpc-dotnet -->
     <GrpcDotnetAssemblyVersion>2.0.0.0</GrpcDotnetAssemblyVersion>