Bump Swashbuckle.AspNetCore.SwaggerGen from 6.7.3 to 6.9.0

Bumps [Swashbuckle.AspNetCore.SwaggerGen](https://github.com/domaindrivendev/Swashbuckle.AspNetCore) from 6.7.3 to 6.9.0.
- [Release notes](https://github.com/domaindrivendev/Swashbuckle.AspNetCore/releases)
- [Commits](domaindrivendev/Swashbuckle.AspNetCore@v6.7.3...v6.9.0)

---
updated-dependencies:
- dependency-name: Swashbuckle.AspNetCore.SwaggerGen
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

src/Tingle.AspNetCore.Swagger/Tingle.AspNetCore.Swagger.csproj

@@ -17,7 +17,7 @@
   <ItemGroup>
     <PackageReference Include="AnyOf" Version="0.4.0" />
     <PackageReference Include="Asp.Versioning.Mvc.ApiExplorer" Version="8.1.0" />
-    <PackageReference Include="Swashbuckle.AspNetCore.SwaggerGen" Version="6.7.3" />
+    <PackageReference Include="Swashbuckle.AspNetCore.SwaggerGen" Version="6.9.0" />
   </ItemGroup>
 
   <ItemGroup>