Merge pull request #1013 from dotnet/dependabot/nuget/Rx.NET/Source/ApprovalTests-4.2.0

Author: dependabot-preview[bot]

Rx.NET/Source/tests/Tests.System.Reactive.ApiApprovals/Tests.System.Reactive.ApiApprovals.csproj

@@ -38,7 +38,7 @@
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.2.0" />
     <PackageReference Include="xunit" Version="2.4.1" />
     <PackageReference Include="xunit.runner.visualstudio" Version="2.4.1" />
-    <PackageReference Include="ApprovalTests" Version="4.0.0" />
+    <PackageReference Include="ApprovalTests" Version="4.2.0" />
     <PackageReference Include="DiffPlex" Version="1.4.4" />
     <PackageReference Include="PublicApiGenerator" Version="7.0.1" />
   </ItemGroup>