Bump MQTTnet.Extensions.ManagedClient

Bumps [MQTTnet.Extensions.ManagedClient](https://github.com/chkr1011/MQTTnet) from 4.0.0-preview1 to 4.0.0-preview3.
- [Release notes](https://github.com/chkr1011/MQTTnet/releases)
- [Commits](https://github.com/chkr1011/MQTTnet/commits)

---
updated-dependencies:
- dependency-name: MQTTnet.Extensions.ManagedClient
  dependency-type: direct:production
  update-type: version-update:semver-patch
...
Signed-off-by: Ndependabot[bot] <support@github.com>

IoTSharp/IoTSharp.csproj

@@ -123,7 +123,7 @@
 		<PackageReference Include="Microsoft.Extensions.Hosting" Version="6.0.0" />
 		<PackageReference Include="Microsoft.Extensions.Hosting.Abstractions" Version="6.0.0" />
 		<PackageReference Include="Microsoft.Extensions.Hosting.WindowsServices" Version="6.0.0" />
-		<PackageReference Include="MQTTnet.Extensions.ManagedClient" Version="4.0.0-preview1" />
+		<PackageReference Include="MQTTnet.Extensions.ManagedClient" Version="4.0.0-preview3" />
 		<PackageReference Include="Microsoft.AspNetCore.SpaServices.Extensions" Version="6.0.1" />
 		<PackageReference Include="Microsoft.AspNetCore.ApiAuthorization.IdentityServer" Version="6.0.1" />
 		<PackageReference Include="Microsoft.AspNetCore.Diagnostics.EntityFrameworkCore" Version="6.0.1" />