Since 1.6.0 TypeVar with bound types fails to match with Callable of the same bound types

Bug Report

Did not occur prior to 1.6.0.

https://github.com/python-cmd2/cmd2/actions/runs/6699406223/job/18203570049
Got the following error with mypy:

cmd2/cmd2.py: note: In member "_build_parser" of class "Cmd":
cmd2/cmd2.py:699:46: error: Argument 1 has incompatible type "CommandParent"; expected "Union[Type[Cmd], Type[CommandSet]]"  [arg-type]
Found 1 error in 1 file (checked 18 source files)

where CommandParent is a TypeVar declared as:

CommandParent = TypeVar('CommandParent', bound=Union['cmd2.Cmd', CommandSet])

To Reproduce

https://github.com/python-cmd2/cmd2/blob/8d88c357ca0764b114c68d8175d2cd33146b83d7/cmd2/cmd2.py#L694

Expected Behavior

Since CommandParent is bound to the expected type, this shouldn't be an error

Actual Behavior

I get the error above.

Your Environment

• Mypy version used: 1.6.1
• Mypy command-line flags:
• Mypy configuration options from mypy.ini (and other config files):
• Python version used: 3.8, 3.9,3.10,3.11

Reproduce the failure from cmd2/cmd2.py around line 694 using mypy 1.6.1 and the reported Python versions. Compare the TypeVar bound with the Callable argument handling, then verify that the reported compatible types no longer produce the arg-type error.