[issue45020] Freeze all modules imported during startup.

[miss-islington]

Change by miss-islington <mariatta.wijaya+miss-islington at gmail.com>:


----------
pull_requests: +26759
pull_request: https://github.com/python/cpython/pull/28346

_______________________________________
Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue45020>
_______________________________________