Merge pull request #1581 from dotnet/dependabot/nuget/Rx.NET/Source/coverlet.collector-3.1.0

Bump coverlet.collector from 3.0.3 to 3.1.0 in /Rx.NET/Source

Rx.NET/Source/Directory.build.props

@@ -32,7 +32,7 @@
   </ItemGroup>
 
   <ItemGroup Condition="'$(IsTestProject)' == 'true'">
-    <PackageReference Include="coverlet.collector" Version="3.0.3" />
+    <PackageReference Include="coverlet.collector" Version="3.1.0" />
   </ItemGroup>
 
 </Project>