Bump System.Runtime.Caching in /src/NetCoreMQTTExampleCluster.Cluster

Bumps [System.Runtime.Caching](https://github.com/dotnet/runtime) from 6.0.0 to 7.0.0.
- [Release notes](https://github.com/dotnet/runtime/releases)
- [Commits](dotnet/runtime@v6.0.0...v7.0.0)

---
updated-dependencies:
- dependency-name: System.Runtime.Caching
  dependency-type: direct:production
...

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

src/NetCoreMQTTExampleCluster.Cluster/NetCoreMQTTExampleCluster.Cluster.csproj

@@ -27,7 +27,7 @@
         <PackageReference Include="Serilog.Sinks.Console" Version="4.0.1" />
         <PackageReference Include="Serilog.Sinks.File" Version="5.0.0" />
         <PackageReference Include="Serilog.Extensions.Logging" Version="3.1.0" />
-        <PackageReference Include="System.Runtime.Caching" Version="6.0.0" />
+        <PackageReference Include="System.Runtime.Caching" Version="7.0.0" />
         <PackageReference Include="Microsoft.Extensions.Hosting.WindowsServices" Version="6.0.0" />
         <PackageReference Include="Microsoft.Orleans.Client" Version="3.6.2" />
     </ItemGroup>