Bump System.Reactive from 4.2.0 to 4.3.2

Bumps [System.Reactive](https://github.com/dotnet/reactive) from 4.2.0 to 4.3.2.
- [Release notes](https://github.com/dotnet/reactive/releases)
- [Commits](dotnet/reactive@rxnet-v4.2.0...rxnet-v4.3.2)

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

Author: dependabot-preview[bot]

Zeroconf/Zeroconf.csproj

@@ -21,7 +21,7 @@
     <EmbeddedResource Include="Properties\Zeroconf.rd.xml" />
     <PackageReference Include="Nerdbank.GitVersioning" Version="3.1.68" PrivateAssets="all" />
     <PackageReference Include="Microsoft.SourceLink.GitHub" Version="1.0.0" PrivateAssets="all" />
-    <PackageReference Include="System.Reactive" Version="4.2.0" />
+    <PackageReference Include="System.Reactive" Version="4.3.2" />
   </ItemGroup>
 
   <Target Name="AddCommitHashToAssemblyAttributes" BeforeTargets="GetAssemblyAttributes">