'find_module' removed in Py3.12; use 'find_spec' instead

[javulticat]

Description

Shout out to @dennybiasiolli for pointing out this issue in #1311! 🙏 However, instead of the branching logic that creates separate codepaths for Py3.12 found in that PR, I believe a simpler solution is possible:

Since the find_spec impl is backwards compatible with find_module and has been available since Py3.4, it should work as a drop-in replacement on all of the Python runtimes Zappa currently supports (Py3.8 - Py3.12), so branching logic shouldn't be necessary.

Note: I intentionally kept this PR as small as possible in order to help expedite it, as it's one of the last remaining blockers for our next release that will bring long-awaited support for Py3.12 to Zappa. That said, further improvements can definitely be made to Zappa's aging CLI impl, such as following DRY principles to consolidate the repetitive lines of code seen here. However, IMO, code cleanup is low priority such that it shouldn't block our next release; instead, it can be considered for inclusion during planning for subsequent Zappa release cycles.

Related

Supersedes #1311
Relates to #1291

[coveralls]

coverage: 74.668% (-0.2%) from 74.831%
when pulling cb0ac96 on jav/py3.12
into 4b4ba4c on master.

[dennybiasiolli]

Nice! And without an "if" in the code, makes perfect sense 😉