Bump MQTTnet from 4.3.7.1207 to 5.0.1.1416 in /src

Bumps [MQTTnet](https://github.com/dotnet/MQTTnet) from 4.3.7.1207 to 5.0.1.1416.
- [Release notes](https://github.com/dotnet/MQTTnet/releases)
- [Commits](https://github.com/dotnet/MQTTnet/commits)

---
updated-dependencies:
- dependency-name: MQTTnet
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

src/ESPresense.Companion.csproj

@@ -25,7 +25,7 @@
     <PackageReference Include="MathNet.Filtering.Kalman" Version="0.7.0" />
     <PackageReference Include="MathNet.Spatial" Version="0.6.0" />
     <PackageReference Include="Microsoft.AspNetCore.SpaProxy" Version="8.0.11" />
-    <PackageReference Include="MQTTnet" Version="4.3.7.1207" />
+    <PackageReference Include="MQTTnet" Version="5.0.1.1416" />
     <PackageReference Include="MQTTnet.Extensions.ManagedClient" Version="4.3.7.1207" />
     <PackageReference Include="Newtonsoft.Json" Version="13.0.3" />
     <PackageReference Include="Nito.AsyncEx" Version="5.1.2" />