Pin iOS 18.0 in Samples and Test apps (#4096)

Author: jamescrosswell

samples/Sentry.Samples.Ios/Sentry.Samples.Ios.csproj

@@ -2,6 +2,7 @@
 
   <PropertyGroup>
     <TargetFramework>net9.0-ios</TargetFramework>
+    <TargetPlatformVersion>18</TargetPlatformVersion>
     <OutputType>Exe</OutputType>
     <Nullable>enable</Nullable>
     <ImplicitUsings>true</ImplicitUsings>

test/Sentry.Maui.Device.TestApp/Sentry.Maui.Device.TestApp.csproj

@@ -4,6 +4,9 @@
     <TargetFrameworks></TargetFrameworks>
     <TargetFrameworks Condition="'$(NO_ANDROID)' == ''">$(TargetFrameworks);net8.0-android;net9.0-android</TargetFrameworks>
     <TargetFrameworks Condition="'$(NO_IOS)' == '' And $([MSBuild]::IsOSPlatform('OSX'))">$(TargetFrameworks);net8.0-ios;net9.0-ios</TargetFrameworks>
+    <!-- Pin target iOS version so that our tests don't break when new versions of Xcode are released.
+      'net8.0-ios' resolves the latest version of the iOS SDK otherwise. -->
+    <TargetPlatformVersion Condition="$([MSBuild]::GetTargetPlatformIdentifier('$(TargetFramework)')) == 'ios'">18</TargetPlatformVersion>
     <UseMaui>true</UseMaui>
     <!-- Currently broken on .NET 7, see
       - https://github.com/dotnet/maui/issues/18573