Add version constraint to importlib_resources

Author: sevein

setup.cfg

@@ -30,7 +30,7 @@ python_requires = >=3.7
 install_requires =
     attrs>=17.4.0
     importlib_metadata;python_version<'3.8'
-    importlib_resources;python_version<'3.9'
+    importlib_resources>=1.4.0;python_version<'3.9'
     pyrsistent>=0.14.0,!=0.17.0,!=0.17.1,!=0.17.2
 
 [options.extras_require]