Bump Swashbuckle.AspNetCore.SwaggerUI from 5.5.1 to 6.9.0 in /src

Bumps [Swashbuckle.AspNetCore.SwaggerUI](https://github.com/domaindrivendev/Swashbuckle.AspNetCore) from 5.5.1 to 6.9.0.
- [Release notes](https://github.com/domaindrivendev/Swashbuckle.AspNetCore/releases)
- [Commits](domaindrivendev/Swashbuckle.AspNetCore@v5.5.1...v6.9.0)

---
updated-dependencies:
- dependency-name: Swashbuckle.AspNetCore.SwaggerUI
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Directory.Build.props

@@ -55,7 +55,7 @@
         <SwashbuckleAspNetCoreAnnotationsVersion>5.5.1</SwashbuckleAspNetCoreAnnotationsVersion>
         <SwashbuckleAspNetCoreFiltersVersion>5.1.2</SwashbuckleAspNetCoreFiltersVersion>
         <SwashbuckleAspNetCoreSwaggerGenVersion>5.5.1</SwashbuckleAspNetCoreSwaggerGenVersion>
-        <SwashbuckleAspNetCoreSwaggerUIVersion>5.5.1</SwashbuckleAspNetCoreSwaggerUIVersion>
+        <SwashbuckleAspNetCoreSwaggerUIVersion>6.9.0</SwashbuckleAspNetCoreSwaggerUIVersion>
         <SwashbuckleAspNetCoreSwaggerVersion>5.5.1</SwashbuckleAspNetCoreSwaggerVersion>
         <XunitRunnerVisualstudioVersion>2.4.2</XunitRunnerVisualstudioVersion>
         <XunitVersion>2.7.0</XunitVersion>