Bump NSwag.Core from 13.19.0 to 13.20.0 (#1374)

Bumps [NSwag.Core](https://github.com/RicoSuter/NSwag) from 13.19.0 to 13.20.0.
- [Release notes](https://github.com/RicoSuter/NSwag/releases)
- [Changelog](https://github.com/RicoSuter/NSwag/blob/master/CHANGELOG.md)
- [Commits](https://github.com/RicoSuter/NSwag/compare/v13.19.0...v13.20.0)

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

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

src/LibKubernetesGenerator/LibKubernetesGenerator.csproj

@@ -13,7 +13,7 @@
     <ItemGroup>
         <PackageReference Include="Autofac" Version="7.1.0" GeneratePathProperty="true" PrivateAssets="all" />
         <PackageReference Include="CaseExtensions" Version="1.1.0" GeneratePathProperty="true" PrivateAssets="all" />
-        <PackageReference Include="NSwag.Core" Version="13.19.0" GeneratePathProperty="true" PrivateAssets="all" />
+        <PackageReference Include="NSwag.Core" Version="13.20.0" GeneratePathProperty="true" PrivateAssets="all" />
         <PackageReference Include="Nustache" Version="1.16.0.10" GeneratePathProperty="true" PrivateAssets="all" NoWarn="NU1701" />
         <PackageReference Include="NJsonSchema" Version="10.9.0" GeneratePathProperty="true" PrivateAssets="all" />
         <PackageReference Include="Microsoft.Bcl.AsyncInterfaces" Version="7.0.0" GeneratePathProperty="true" PrivateAssets="all" />