Bump NSwag.CodeGeneration.CSharp from 13.18.2 to 13.18.3

Bumps [NSwag.CodeGeneration.CSharp](https://github.com/RicoSuter/NSwag) from 13.18.2 to 13.18.3.
- [Release notes](https://github.com/RicoSuter/NSwag/releases)
- [Changelog](https://github.com/RicoSuter/NSwag/blob/master/CHANGELOG.md)
- [Commits](RicoSuter/NSwag@v13.18.2...v13.18.3)

---
updated-dependencies:
- dependency-name: NSwag.CodeGeneration.CSharp
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

src/Refitter.Core/Refitter.Core.csproj

@@ -26,7 +26,7 @@
     </PropertyGroup>
 
     <ItemGroup>
-      <PackageReference Include="NSwag.CodeGeneration.CSharp" Version="13.18.2" />
+      <PackageReference Include="NSwag.CodeGeneration.CSharp" Version="13.18.3" />
       <PackageReference Include="NSwag.Core.Yaml" Version="13.18.3" />
     </ItemGroup>