[flutter_tools] increment y instead of m when calling flutter --version on master (#97827)

packages/flutter_tools/lib/src/version.dart

@@ -736,7 +736,9 @@ class GitTagVersion {
       return '$x.$y.$z+hotfix.${hotfix! + 1}.pre.$commits';
     }
     if (devPatch != null && devVersion != null) {
-      return '$x.$y.$z-${devVersion! + 1}.0.pre.$commits';
+      // The next published release this commit will appear in will be a beta
+      // release, thus increment [y].
+      return '$x.${y! + 1}.0-0.0.pre.$commits';
     }
     return '$x.$y.${z! + 1}-0.0.pre.$commits';
   }

packages/flutter_tools/test/general.shard/version_test.dart

@@ -372,7 +372,7 @@ void main() {
 
     // Master channel
     gitTagVersion = GitTagVersion.parse('1.2.3-4.5.pre-13-g$hash');
-    expect(gitTagVersion.frameworkVersionFor(hash), '1.2.3-5.0.pre.13');
+    expect(gitTagVersion.frameworkVersionFor(hash), '1.3.0-0.0.pre.13');
     expect(gitTagVersion.gitTag, '1.2.3-4.5.pre');
     expect(gitTagVersion.devVersion, 4);
     expect(gitTagVersion.devPatch, 5);
@@ -491,8 +491,8 @@ void main() {
       logger: BufferLogger.test(),
     );
     final GitTagVersion gitTagVersion = GitTagVersion.determine(processUtils, workingDirectory: '.');
-    // reported version should increment the number after the dash
-    expect(gitTagVersion.frameworkVersionFor(headRevision), '1.2.3-3.0.pre.12');
+    // reported version should increment the y
+    expect(gitTagVersion.frameworkVersionFor(headRevision), '1.3.0-0.0.pre.12');
   });
 
   testUsingContext('determine does not call fetch --tags', () {