chore(deps): bump System.Reactive in /src/messaging/dotnet/src/Client

Bumps [System.Reactive](https://github.com/dotnet/reactive) from 6.0.0 to 6.0.1.
- [Release notes](https://github.com/dotnet/reactive/releases)
- [Commits](https://github.com/dotnet/reactive/commits/ixnet-v6.0.1)

---
updated-dependencies:
- dependency-name: System.Reactive
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Directory.Packages.props

@@ -48,7 +48,7 @@
     <PackageVersion Include="System.Management" Version="8.0.0" />
     <PackageVersion Include="System.Net.Http" Version="4.3.4" />
     <PackageVersion Include="System.Reactive.Async" Version="6.0.0-alpha.18" />
-    <PackageVersion Include="System.Reactive" Version="6.0.0" />
+    <PackageVersion Include="System.Reactive" Version="6.0.1" />
     <PackageVersion Include="System.ServiceModel.Primitives" Version="6.2.0" />
     <PackageVersion Include="System.Text.Json" Version="8.0.3" />
     <PackageVersion Include="TestableIO.System.IO.Abstractions.Wrappers" Version="21.0.2" />