fix: Handle error message difference

Author: nielsenko

packages/cli_tools/test/execute_test.dart

@@ -46,7 +46,7 @@ void main() {
       () async {
         final result = await runDriver('fhasjkhfs');
         expect(result.exitCode, isNot(0));
-        expect(result.stderr, contains('not found'));
+        expect(result.stderr, contains(Platform.isWindows ? 'not recognized' : 'not found'));
       },
     );