build(deps): bump Pastel from 5.1.0 to 5.2.1 in /csharp (#257)

Bumps [Pastel](https://github.com/silkfire/Pastel) from 5.1.0 to 5.2.1.
- [Release notes](https://github.com/silkfire/Pastel/releases)
- [Commits](silkfire/Pastel@v5.1.0...v5.2.1)

---
updated-dependencies:
- dependency-name: Pastel
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

csharp/Othello/Othello.csproj

@@ -36,7 +36,7 @@
   </ItemGroup>
 
   <ItemGroup>
-    <PackageReference Include="Pastel" Version="5.1.0" />
+    <PackageReference Include="Pastel" Version="5.2.1" />
     <PackageReference Include="System.CommandLine" Version="2.0.0-beta4.22272.1" />
   </ItemGroup>