meta: bump Ix.Net to 3.2.0

src/Discord.Net.Core/Discord.Net.Core.csproj

@@ -10,7 +10,7 @@
   <ItemGroup>
     <PackageReference Include="Newtonsoft.Json" Version="11.0.2" />
     <PackageReference Include="System.Collections.Immutable" Version="1.3.1" />
-    <PackageReference Include="System.Interactive.Async" Version="3.1.1" />
+    <PackageReference Include="System.Interactive.Async" Version="3.2.0" />
     <PackageReference Include="IDisposableAnalyzers" Version="2.1.2">
       <PrivateAssets>all</PrivateAssets>
     </PackageReference>