Stubgen hangs forever for some packages

Bug Report

When executing
stubgen --package great_expectations --output ../dist/result/stubs1/bundled/stubs/great_expectations/

The output is:

2024-09-12T13:12:29+0800 - INFO - Great Expectations logging enabled at 20 level by JupyterUX module.
2024-09-12T13:12:29+0800 - INFO - Could not find local file-backed GX project
2024-09-12T13:12:29+0800 - INFO - Created temporary directory '/tmp/tmp2cxwhcay' for ephemeral docs site
2024-09-12T13:12:29+0800 - INFO - Loading 'datasources' ->
[]
2024-09-12T13:12:30+0800 - INFO - Great Expectations logging enabled at 20 level by JupyterUX module.
Processed 580 modules
Generated files under ../dist/result/stubs1/bundled/stubs/great_expectations/great_expectations/

The generation seems to be successful. But:

1. There are some abnormal logs, and seems that they are from inside the package.
2. The process hangs forever after the last line of output. It doesn't exit.

To Reproduce
Install package great-expectations==0.18.17, and then executing
stubgen --package great_expectations

Expected Behavior

Stubgen should exit after finishing stubs generation.

Actual Behavior

It would hang forever.

Your Environment

• Mypy version used: 1.4.1
• Mypy command-line flags: none
• Mypy configuration options from mypy.ini (and other config files): none
• Python version used: python 3.11

Reproduce the hang with stubgen --package great_expectations using great-expectations 0.18.17, then trace the stubgen command after the reported Generated files line. Check why the process remains alive after generation and verify that the command exits once stub generation completes without leaving the abnormal package logs unresolved.