Update NuGet packages

Update a number of NuGet packages to their latest versions.

Author: martincostello

Directory.Packages.props

@@ -4,11 +4,11 @@
     <PackageVersion Include="JetBrains.Annotations" Version="2020.1.0" />
     <PackageVersion Include="JustEat.HttpClientInterception" Version="3.0.0" />
     <PackageVersion Include="MartinCostello.Logging.XUnit" Version="0.1.0" />
-    <PackageVersion Include="Microsoft.AspNetCore.Authentication.Google" Version="3.1.5" />
-    <PackageVersion Include="Microsoft.AspNetCore.Authentication.Twitter" Version="3.1.5" />
-    <PackageVersion Include="Microsoft.AspNetCore.Mvc.Testing" Version="3.1.5" />
-    <PackageVersion Include="Microsoft.AspNetCore.TestHost" Version="3.1.5" />
-    <PackageVersion Include="Microsoft.CodeAnalysis.FxCopAnalyzers" Version="3.0.0" />
+    <PackageVersion Include="Microsoft.AspNetCore.Authentication.Google" Version="3.1.7" />
+    <PackageVersion Include="Microsoft.AspNetCore.Authentication.Twitter" Version="3.1.7" />
+    <PackageVersion Include="Microsoft.AspNetCore.Mvc.Testing" Version="3.1.7" />
+    <PackageVersion Include="Microsoft.AspNetCore.TestHost" Version="3.1.7" />
+    <PackageVersion Include="Microsoft.CodeAnalysis.FxCopAnalyzers" Version="3.3.0" />
     <PackageVersion Include="Microsoft.IdentityModel.Protocols.OpenIdConnect" Version="5.5.0" />
     <PackageVersion Include="Moq" Version="4.14.5" />
     <PackageVersion Include="Shouldly" Version="3.0.2" />