chore(deps): update dependency microsoft.codeanalysis.csharp to v4.6.0 (

#311)

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This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [Microsoft.CodeAnalysis.CSharp](https://togithub.com/dotnet/roslyn) |
nuget | minor | `4.5.0` -> `4.6.0` |

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Tests/Helpers/Testably.Abstractions.Tests.SourceGenerator/Testably.Abstractions.Tests.SourceGenerator.csproj

@@ -8,7 +8,7 @@
 	</PropertyGroup>
 
 	<ItemGroup>
-		<PackageReference Include="Microsoft.CodeAnalysis.CSharp" Version="4.5.0" PrivateAssets="all" />
+		<PackageReference Include="Microsoft.CodeAnalysis.CSharp" Version="4.6.0" PrivateAssets="all" />
 		<PackageReference Include="Microsoft.CodeAnalysis.Analyzers" Version="3.3.4" PrivateAssets="all" />
 	</ItemGroup>