[tests] Adjust some tests according to changes in .NET.

Author: rolfbjarne

tests/dotnet/UnitTests/ProjectTest.cs

@@ -529,10 +529,10 @@ public void InvalidRuntimeIdentifier (ApplePlatform platform, string runtimeIden
 		}
 
 		[Test]
-		[TestCase (ApplePlatform.iOS, "win10-x86", null)]
-		[TestCase (ApplePlatform.TVOS, "win10-x64", null)]
-		[TestCase (ApplePlatform.MacOSX, "win10-arm64", null)]
-		[TestCase (ApplePlatform.MacCatalyst, "win10-arm64", "Unable to find package Microsoft.NETCore.App.Runtime.Mono.win-arm64. No packages exist with this id in source[(]s[)]:.*")]
+		[TestCase (ApplePlatform.iOS, "win10-x86", "The specified RuntimeIdentifier 'win10-x86' is not recognized.")]
+		[TestCase (ApplePlatform.TVOS, "win10-x64", "The specified RuntimeIdentifier 'win10-x64' is not recognized.")]
+		[TestCase (ApplePlatform.MacOSX, "win10-arm64", "The specified RuntimeIdentifier 'win10-arm64' is not recognized.")]
+		[TestCase (ApplePlatform.MacCatalyst, "win10-arm64", "The specified RuntimeIdentifier 'win10-arm64' is not recognized.")]
 		public void InvalidRuntimeIdentifier_Restore (ApplePlatform platform, string runtimeIdentifier, string? failureMessagePattern)
 		{
 			var project = "MySimpleApp";