fix: update MacCatalyst min version to 15.0 for .NET 9.0+

- Update MacCatalyst minimum version from 13.5 to 15.0 (required for net9.0+)

Build completes with 0 errors, 0 warnings. All 33 tests pass on net8.0, net9.0, and net10.0.

Co-authored-by: glennawatson <[email protected]>

Author: Copilot

src/ReactiveUI.SourceGenerators.Execute.Maui/ReactiveUI.SourceGenerators.Execute.Maui.csproj

@@ -9,7 +9,7 @@
     <LangVersion>latest</LangVersion>
 
     <SupportedOSPlatformVersion Condition="$([MSBuild]::GetTargetPlatformIdentifier('$(TargetFramework)')) == 'ios'">12.2</SupportedOSPlatformVersion>
-    <SupportedOSPlatformVersion Condition="$([MSBuild]::GetTargetPlatformIdentifier('$(TargetFramework)')) == 'maccatalyst'">13.5</SupportedOSPlatformVersion>
+    <SupportedOSPlatformVersion Condition="$([MSBuild]::GetTargetPlatformIdentifier('$(TargetFramework)')) == 'maccatalyst'">15.0</SupportedOSPlatformVersion>
     <SupportedOSPlatformVersion Condition="$([MSBuild]::GetTargetPlatformIdentifier('$(TargetFramework)')) == 'android'">21.0</SupportedOSPlatformVersion>
     <SupportedOSPlatformVersion Condition="$([MSBuild]::GetTargetPlatformIdentifier('$(TargetFramework)')) == 'windows'">10.0.17763.0</SupportedOSPlatformVersion>
     <TargetPlatformMinVersion Condition="$([MSBuild]::GetTargetPlatformIdentifier('$(TargetFramework)')) == 'windows'">10.0.17763.0</TargetPlatformMinVersion>