Update the analyzer constraint

Author: atoka93

openapi-generator/pubspec.yaml

@@ -11,7 +11,7 @@ dependencies:
   source_gen: '>=1.0.0 <=2.0.0'
   path: '>=1.0.0 <=2.0.0'
   openapi_generator_annotations: ^3.3.0
-  analyzer: '>=1.4.0 <=3.0.0'
+  analyzer: '>=1.4.0 <=5.0.0'
   openapi_generator_cli: ^3.3.0
 
 dev_dependencies: