Bump Microsoft.CodeAnalysis.CSharp.Workspaces

Bumps the dotnet group in /samples/snippets/csharp/roslyn-sdk/SyntaxQuickStart with 1 update: [Microsoft.CodeAnalysis.CSharp.Workspaces](https://github.com/dotnet/roslyn).


Updates `Microsoft.CodeAnalysis.CSharp.Workspaces` from 4.11.0 to 4.12.0
- [Release notes](https://github.com/dotnet/roslyn/releases)
- [Changelog](https://github.com/dotnet/roslyn/blob/main/docs/Breaking%20API%20Changes.md)
- [Commits](https://github.com/dotnet/roslyn/commits)

---
updated-dependencies:
- dependency-name: Microsoft.CodeAnalysis.CSharp.Workspaces
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: dotnet
...

Signed-off-by: dependabot[bot] <[email protected]>

samples/snippets/csharp/roslyn-sdk/SyntaxQuickStart/HelloSyntaxTree/HelloSyntaxTree.csproj

@@ -7,7 +7,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.CodeAnalysis.CSharp.Workspaces" Version="4.11.0" />
+    <PackageReference Include="Microsoft.CodeAnalysis.CSharp.Workspaces" Version="4.12.0" />
   </ItemGroup>
 
 </Project>

samples/snippets/csharp/roslyn-sdk/SyntaxQuickStart/SyntaxWalker/SyntaxWalker.csproj

@@ -7,7 +7,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.CodeAnalysis.CSharp.Workspaces" Version="4.11.0" />
+    <PackageReference Include="Microsoft.CodeAnalysis.CSharp.Workspaces" Version="4.12.0" />
   </ItemGroup>
 
 </Project>