Fix build of Rx.NET integration tests

Rx.NET/Integration/LinuxTests/LinuxTests.csproj

@@ -24,11 +24,11 @@
   </ItemGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.7.1" />    
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.7.1" />
     <PackageReference Include="xunit" Version="2.4.1" />
     <PackageReference Include="xunit.runner.visualstudio" Version="2.4.1" />
-    <PackageReference Include="System.Reactive" Version="4.2.0-preview.63" />
-    <PackageReference Include="Microsoft.Reactive.Testing" Version="4.2.0-preview.63" />
-    <PackageReference Include="System.Reactive.Observable.Aliases" Version="4.2.0-preview.63" />
+    <PackageReference Include="System.Reactive" Version="5.1.0-preview*" />
+    <PackageReference Include="Microsoft.Reactive.Testing" Version="5.1.0-preview*" />
+    <PackageReference Include="System.Reactive.Observable.Aliases" Version="5.1.0-preview*" />
   </ItemGroup>
 </Project>

Rx.NET/Integration/WindowsDesktopTests/WindowsDesktopTests.csproj

@@ -29,11 +29,11 @@
   </ItemGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.7.1" />    
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.7.1" />
     <PackageReference Include="xunit" Version="2.4.1" />
     <PackageReference Include="xunit.runner.visualstudio" Version="2.4.1" />
-    <PackageReference Include="System.Reactive" Version="4.2.0-preview.63" />
-    <PackageReference Include="Microsoft.Reactive.Testing" Version="4.2.0-preview.63" />
-    <PackageReference Include="System.Reactive.Observable.Aliases" Version="4.2.0-preview.63" />
+    <PackageReference Include="System.Reactive" Version="5.1.0-preview*" />
+    <PackageReference Include="Microsoft.Reactive.Testing" Version="5.1.0-preview*" />
+    <PackageReference Include="System.Reactive.Observable.Aliases" Version="5.1.0-preview*" />
   </ItemGroup>
 </Project>