gh-141172: Update to wasi-sdk-29

[alexcrichton]

This commit updates CI and configuration from wasi-sdk-25 to wasi-sdk-29 which was released recently. This notably includes stubs for pthreads which all return errors, so some adjustment in logic is necessary to retain knowledge that WASI cannot yet spawn threads for example.

This additionally increases the wasm stack allowance to 32MiB from 16MiB to accomodate the test_recursive_pickle test in teh test_functools.py file. It looks like the Clang/LLVM update that happened in wasi-sdk-29 relative to wasi-sdk-25 is likely the cause of this where presumably functions have more locals than before and/or a slightly adjusted stack space requirement which overflows the stack.

cc @brettcannon

• Issue: Try to get WASI SDK 29 working #141172

[python-cla-bot]

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[brettcannon]

Can you create a news entry for this? Otherwise it LGTM!

[bedevere-app]

A Python core developer has requested some changes be made to your pull request before we can consider merging it. If you could please address their requests along with any other requests in other reviews from core developers that would be appreciated.

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[bedevere-app]

Most changes to Python require a NEWS entry. Add one using the blurb_it web app or the blurb command-line tool.

If this change has little impact on Python users, wait for a maintainer to apply the skip news label instead.

[alexcrichton]

I have made the requested changes; please review again

Happy to expand as well, I wasn't sure how much needs to be mentioned other than an update happened

[bedevere-app]

Thanks for making the requested changes!

@brettcannon: please review the changes made to this pull request.

[brettcannon]

Thanks!

[bedevere-bot]

⚠️⚠️⚠️ Buildbot failure ⚠️⚠️⚠️

Hi! The buildbot wasm32-wasi 3.x (tier-2) has failed when building commit 9b69a55.

What do you need to do:

1. Don't panic.
2. Check the buildbot page in the devguide if you don't know what the buildbots are or how they work.
3. Go to the page of the buildbot that failed (https://buildbot.python.org/#/builders/1046/builds/10237) and take a look at the build logs.
4. Check if the failure is related to this commit (9b69a55) or if it is a false positive.
5. If the failure is related to this commit, please, reflect that on the issue and make a new Pull Request with a fix.

You can take a look at the buildbot page here:

https://buildbot.python.org/#/builders/1046/builds/10237

Failed tests:

• test_sys

Failed subtests:

• test_thread_info - test.test_sys.SysModuleTest.test_thread_info

Summary of the results of the build (if available):

==

Click to see traceback logs

Traceback (most recent call last):
  File "/Lib/test/test_sys.py", line 734, in test_thread_info
    self.assertEqual(info.name, "pthread")
    ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^
AssertionError: 'pthread-stubs' != 'pthread'
- pthread-stubs
+ pthread

[brettcannon]

The failure is on the Buildbot side. I think if I make sure to install WASI SDK 29 on it then the issue will be resolved. Going to do that now.

[brettcannon]

https://buildbot.python.org/all/#/builders/1046/builds/10238 picked up the new WASI SDK install on the Buildbot. I'm just waiting for the run to finish before declaring everything is okay.

[brettcannon]

All good now!