mypy

6877d6fb - Make syntax of generic overload variants in messages close to PEP 695 (#17401)

Make syntax of generic overload variants in messages close to PEP 695 (#17401) We used a custom syntax for type variable bounds and restrictions. Use PEP 695 syntax instead (or at least something closer to PEP 695 syntax). Co-authored-by: Ivan Levkivskyi <levkivskyi@gmail.com>