`tomllib` is considered as third-party lib in py3.11 but it is built-in now

https://docs.python.org/3/library/tomllib.html

It can be a part of an "epic" called "Support for python3.11" #1996 

Behavior before:
```
@@ -1,8 +1,10 @@
-import tomllib
from pathlib import Path
from typing import Generator
 
+import tomllib
...
```

Behavior after:
The message that everything is OK

Version: 5.10.1