Xcode 13 as minimum recommended version (flutter#90906)

Author: jmagman

packages/flutter_tools/lib/src/macos/xcode.dart

@@ -22,7 +22,7 @@ Version get xcodeRequiredVersion => Version(12, 0, 1, text: '12.0.1');
 
 /// Diverging this number from the minimum required version will provide a doctor
 /// warning, not error, that users should upgrade Xcode.
-Version get xcodeRecommendedVersion => xcodeRequiredVersion;
+Version get xcodeRecommendedVersion => Version(13, 0, 0, text: '13.0.0');
 
 /// SDK name passed to `xcrun --sdk`. Corresponds to undocumented Xcode
 /// SUPPORTED_PLATFORMS values.

packages/flutter_tools/test/general.shard/macos/xcode_test.dart

@@ -189,28 +189,28 @@ void main() {
 
         testWithoutContext('isRecommendedVersionSatisfactory is true when version meets minimum', () {
           xcodeProjectInterpreter.isInstalled = true;
-          xcodeProjectInterpreter.version = Version(12, 0, 1);
+          xcodeProjectInterpreter.version = Version(13, 0, 0);
 
           expect(xcode.isRecommendedVersionSatisfactory, isTrue);
         });
 
         testWithoutContext('isRecommendedVersionSatisfactory is true when major version exceeds minimum', () {
           xcodeProjectInterpreter.isInstalled = true;
-          xcodeProjectInterpreter.version = Version(13, 0, 0);
+          xcodeProjectInterpreter.version = Version(14, 0, 0);
 
           expect(xcode.isRecommendedVersionSatisfactory, isTrue);
         });
 
         testWithoutContext('isRecommendedVersionSatisfactory is true when minor version exceeds minimum', () {
           xcodeProjectInterpreter.isInstalled = true;
-          xcodeProjectInterpreter.version = Version(12, 3, 0);
+          xcodeProjectInterpreter.version = Version(13, 3, 0);
 
           expect(xcode.isRecommendedVersionSatisfactory, isTrue);
         });
 
         testWithoutContext('isRecommendedVersionSatisfactory is true when patch version exceeds minimum', () {
           xcodeProjectInterpreter.isInstalled = true;
-          xcodeProjectInterpreter.version = Version(12, 0, 2);
+          xcodeProjectInterpreter.version = Version(13, 0, 2);
 
           expect(xcode.isRecommendedVersionSatisfactory, isTrue);
         });

packages/flutter_tools/test/general.shard/macos/xcode_validator_test.dart

@@ -69,8 +69,8 @@ void main() {
       final ValidationResult result = await validator.validate();
       expect(result.type, ValidationType.partial);
       expect(result.messages.last.type, ValidationMessageType.hint);
-      expect(result.messages.last.message, contains('Flutter recommends a minimum Xcode version of 12.0.2'));
-    }, skip: true); // [intended] Unskip and update when minimum and required check versions diverge.
+      expect(result.messages.last.message, contains('Flutter recommends a minimum Xcode version of 13.0.0'));
+    });
 
     testWithoutContext('Emits partial status when Xcode EULA not signed', () async {
       final ProcessManager processManager = FakeProcessManager.list(<FakeCommand>[