Update .NET SDK and packages

Update to the latest .NET 5.0 SDK.
Update test/sample NuGet packages to their latest versions.

Author: martincostello

Packages.props

@@ -4,12 +4,12 @@
     <PackageReference Update="JetBrains.Annotations" Version="2020.3.0" />
     <PackageReference Update="JustEat.HttpClientInterception" Version="3.1.0" />
     <PackageReference Update="MartinCostello.Logging.XUnit" Version="0.1.0" />
-    <PackageReference Update="Microsoft.AspNetCore.Authentication.Google" Version="5.0.2" />
-    <PackageReference Update="Microsoft.AspNetCore.Authentication.Twitter" Version="5.0.2" />
-    <PackageReference Update="Microsoft.AspNetCore.Mvc.Testing" Version="5.0.2" />
-    <PackageReference Update="Microsoft.AspNetCore.TestHost" Version="5.0.2" />
+    <PackageReference Update="Microsoft.AspNetCore.Authentication.Google" Version="5.0.4" />
+    <PackageReference Update="Microsoft.AspNetCore.Authentication.Twitter" Version="5.0.4" />
+    <PackageReference Update="Microsoft.AspNetCore.Mvc.Testing" Version="5.0.4" />
+    <PackageReference Update="Microsoft.AspNetCore.TestHost" Version="5.0.4" />
     <PackageReference Update="Microsoft.IdentityModel.Protocols.OpenIdConnect" Version="6.6.0" />
-    <PackageReference Update="Moq" Version="4.16.0" />
+    <PackageReference Update="Moq" Version="4.16.1" />
     <PackageReference Update="Shouldly" Version="4.0.3" />
     <PackageReference Update="StyleCop.Analyzers" Version="1.1.118" />
     <PackageReference Update="System.IdentityModel.Tokens.Jwt" Version="6.6.0" />

global.json

@@ -1,6 +1,6 @@
 {
   "tools": {
-    "dotnet": "5.0.102"
+    "dotnet": "5.0.201"
   },
 
   "msbuild-sdks": {