fix function name in codegen.py for python v3.11

[MMF3775]

Things to check first

• I have searched the existing issues and didn't find my bug already reported there

• I have checked that my bug is still present in the latest release

Sqlacodegen version

2.3.0.post1

SQLAlchemy version

1.4.49

RDBMS vendor

PostgreSQL

What happened?

in inspect.py in python 3.11 ArgSpec variable name changed to FullArgSpec and if we use this package in python 3.11 we got error "from inspect import ArgSpec
ImportError: cannot import name 'ArgSpec' from 'inspect' (C:\Python311\Lib\inspect.py)"

it will be fixed if you change "from inspect import ArgSpec" to "from inspect import FullArgSpec" in codegen.py

Database schema for reproducing the bug

No response

[agronholm]

Already fixed in master, and in the 3.0 release candidates.