Bump Microsoft.CodeAnalysis.CSharp and Microsoft.CodeAnalysis.CSharp.Workspaces

Bumps Microsoft.CodeAnalysis.CSharp from 4.12.0 to 5.0.0
Bumps Microsoft.CodeAnalysis.CSharp.Workspaces from 4.12.0 to 5.0.0

---
updated-dependencies:
- dependency-name: Microsoft.CodeAnalysis.CSharp
  dependency-version: 5.0.0
  dependency-type: direct:production
  update-type: version-update:semver-major
- dependency-name: Microsoft.CodeAnalysis.CSharp.Workspaces
  dependency-version: 5.0.0
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

src/RoslynDiff.Core/RoslynDiff.Core.csproj

@@ -6,8 +6,8 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.CodeAnalysis.CSharp" Version="4.12.0" />
-    <PackageReference Include="Microsoft.CodeAnalysis.CSharp.Workspaces" Version="4.12.0" />
+    <PackageReference Include="Microsoft.CodeAnalysis.CSharp" Version="5.0.0" />
+    <PackageReference Include="Microsoft.CodeAnalysis.CSharp.Workspaces" Version="5.0.0" />
     <PackageReference Include="Microsoft.CodeAnalysis.VisualBasic" Version="4.12.0" />
     <PackageReference Include="Microsoft.CodeAnalysis.VisualBasic.Workspaces" Version="4.12.0" />
     <PackageReference Include="DiffPlex" Version="1.7.2" />