Bump Swashbuckle.AspNetCore.Newtonsoft from 6.7.1 to 6.7.3

Bumps [Swashbuckle.AspNetCore.Newtonsoft](https://github.com/domaindrivendev/Swashbuckle.AspNetCore) from 6.7.1 to 6.7.3.
- [Release notes](https://github.com/domaindrivendev/Swashbuckle.AspNetCore/releases)
- [Commits](domaindrivendev/Swashbuckle.AspNetCore@v6.7.1...v6.7.3)

---
updated-dependencies:
- dependency-name: Swashbuckle.AspNetCore.Newtonsoft
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

src/Tgstation.Server.Host/Tgstation.Server.Host.csproj

@@ -139,7 +139,7 @@
     <!-- Usage: OpenAPI spec generator -->
     <PackageReference Include="Swashbuckle.AspNetCore" Version="6.7.3" />
     <!-- Usage: Newtonsoft.Json plugin for OpenAPI spec generator -->
-    <PackageReference Include="Swashbuckle.AspNetCore.Newtonsoft" Version="6.7.1" />
+    <PackageReference Include="Swashbuckle.AspNetCore.Newtonsoft" Version="6.7.3" />
     <!-- Usage: Windows authentication plugin allowing searching for users by name -->
     <PackageReference Include="System.DirectoryServices.AccountManagement" Version="8.0.0" />
     <!-- Usage: Identifying owning user of Windows Process objects -->