chore(deps): update dependency microsoft.codeanalysis.csharp to v4.8.0 (

#69)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [Microsoft.CodeAnalysis.CSharp](https://togithub.com/dotnet/roslyn) |
`4.7.0` -> `4.8.0` |
[![age](https://developer.mend.io/api/mc/badges/age/nuget/Microsoft.CodeAnalysis.CSharp/4.8.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![adoption](https://developer.mend.io/api/mc/badges/adoption/nuget/Microsoft.CodeAnalysis.CSharp/4.8.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![passing](https://developer.mend.io/api/mc/badges/compatibility/nuget/Microsoft.CodeAnalysis.CSharp/4.7.0/4.8.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![confidence](https://developer.mend.io/api/mc/badges/confidence/nuget/Microsoft.CodeAnalysis.CSharp/4.7.0/4.8.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|

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Directory.Packages.props

@@ -16,7 +16,7 @@
 	</ItemGroup>
 
 	<ItemGroup>
-		<PackageVersion Include="Microsoft.CodeAnalysis.CSharp" Version="4.7.0" />
+		<PackageVersion Include="Microsoft.CodeAnalysis.CSharp" Version="4.8.0" />
 		<PackageVersion Include="Microsoft.CodeAnalysis.Analyzers" Version="3.3.4" />
 	</ItemGroup>