Fix output match (flutter#116912)

Author: loic-sharma

packages/flutter_tools/test/commands.shard/permeable/packages_test.dart

@@ -211,7 +211,7 @@ void main() {
       expect(mockStdio.stdout.writes.map(utf8.decode),
         allOf(
           contains(matches(RegExp(r'Resolving dependencies in .+flutter_project\.\.\.'))),
-          contains(matches(RegExp(r'\+ flutter 0.0.0 from sdk flutter\n'))),
+          contains(matches(RegExp(r'\+ flutter 0\.0\.0 from sdk flutter'))),
           contains(matches(RegExp(r'Changed \d+ dependencies in .+flutter_project!'))),
         ),
       );