Bump Swashbuckle.AspNetCore from 6.3.2 to 6.4.0 in /src

Bumps [Swashbuckle.AspNetCore](https://github.com/domaindrivendev/Swashbuckle.AspNetCore) from 6.3.2 to 6.4.0.
- [Release notes](https://github.com/domaindrivendev/Swashbuckle.AspNetCore/releases)
- [Commits](domaindrivendev/Swashbuckle.AspNetCore@v6.3.2...v6.4.0)

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

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

src/AzureIoTHub.Portal/Server/AzureIoTHub.Portal.Server.csproj

@@ -52,7 +52,7 @@
     <PackageReference Include="NetEscapades.AspNetCore.SecurityHeaders" Version="0.17.0" />
     <PackageReference Include="Newtonsoft.Json" Version="13.0.1" />
     <PackageReference Include="prometheus-net.AspNetCore" Version="6.0.0" />
-    <PackageReference Include="Swashbuckle.AspNetCore" Version="6.3.2" />
+    <PackageReference Include="Swashbuckle.AspNetCore" Version="6.4.0" />
   </ItemGroup>
 
   <ItemGroup>