[Bug] Obsolete typing.io import

[srittau]

🐛 Bug

Description

hydra-core 1.2.0 contains two generated files with an obsolete import from typing.io import TextIO. The typing.io namespace has been deprecated since Python 3.8 and will be removed in Python 3.12. (Cf. python/cpython#92871) The imports can simply be replaced with from typing import TextIO:

• hydra/grammar/gen/OverrideLexer.py
• hydra/grammar/gen/OverrideParser.py

Checklist

• I checked on the latest version of Hydra
• I created a minimal repro (See this for tips).

System information

• Hydra Version : 1.2.0
• Python version :
• Virtual environment type and version :
• Operating system :

[pixelb]

This was addressed implicitly by the upgrade of antlr from 4.8 to 4.9 (in issue #2155)
which guards the old use of typing.io with a python version check.