Set version to 7.0 and update WindowsDesktopTests

Rx.NET/Integration/WindowsDesktopTests/WindowsDesktopTests.csproj

@@ -27,10 +27,10 @@
     <PackageReference Include="MSTest.TestAdapter" Version="3.0.2" />
     <PackageReference Include="MSTest.TestFramework" Version="3.0.2" />
     <PackageReference Include="xunit.assert" Version="2.4.2" />
-    <PackageReference Include="System.Reactive" Version="6.0.0-preview*" />
-    <PackageReference Include="System.Reactive.Integration.WindowsForms" Version="6.0.0-preview*" />
-    <PackageReference Include="System.Reactive.Integration.Wpf" Version="6.0.0-preview*" />
-    <PackageReference Include="Microsoft.Reactive.Testing" Version="6.0.0-preview*" />
-    <PackageReference Include="System.Reactive.Observable.Aliases" Version="6.0.0-preview*" />
+    <PackageReference Include="System.Reactive" Version="7.0.0-preview*" />
+    <PackageReference Include="System.Reactive.Integration.WindowsForms" Version="7.0.0-preview*" />
+    <PackageReference Include="System.Reactive.Integration.Wpf" Version="7.0.0-preview*" />
+    <PackageReference Include="Microsoft.Reactive.Testing" Version="7.0.0-preview*" />
+    <PackageReference Include="System.Reactive.Observable.Aliases" Version="7.0.0-preview*" />
   </ItemGroup>
 </Project>

Rx.NET/Source/version.json

@@ -1,5 +1,5 @@
 {
-  "version": "6.0.1-preview.{height}",
+  "version": "7.0.0-preview.{height}",
   "publicReleaseRefSpec": [
     "^refs/heads/main$", // we release out of main
     "^refs/heads/rel/v\\d+\\.\\d+", // we also release branches starting with rel/vN.N