CI: try Python 3.15 release candidate (DRAFT — hold until 3.15 GA)

[priya-sundaram-dev]

Part of the maintenance experiments requested in #15081.

What this does

Points the CI workflows at the Python 3.15 release candidate (python-version: 3.15, with allow-prereleases: true, which was already enabled) and adds the Programming Language :: Python :: 3.15 trove classifier.

Status: DRAFT until 3.15 GA

Per the request, this stays in DRAFT until Python 3.15 has a production release (early October) — it should not merge before then.

Intentionally minimal

• requires-python stays >=3.14 (still accurate) and [tool.mypy] python_version stays 3.14 for now, so mypy keeps type-checking against the current stable target. Bumping those is a separate decision for after 3.15 GA.
• The goal here is to let CI tell us which dependencies don't yet publish cp315 wheels and which tests break on the RC. I'll record the specific failures as comments on this PR as CI reports them.

[algorithms-keeper]

Closing this pull request as invalid

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[cclauss]

algorithms-keeper is a bit strict about its checkboxes!

[cclauss]

Pytest says:

ERROR machine_learning/automatic_differentiation.py - AttributeError: module 'typing' has no attribute 'no_type_check_decorator'
ERROR web_programming/crawl_google_results.py - AttributeError: module 'typing' has no attribute 'no_type_check_decorator'
ERROR web_programming/crawl_google_scholar_citation.py - AttributeError: module 'typing' has no attribute 'no_type_check_decorator'
ERROR web_programming/daily_horoscope.py - AttributeError: module 'typing' has no attribute 'no_type_check_decorator'
ERROR web_programming/download_images_from_google_query.py - AttributeError: module 'typing' has no attribute 'no_type_check_decorator'
ERROR web_programming/fetch_jobs.py - AttributeError: module 'typing' has no attribute 'no_type_check_decorator'
ERROR web_programming/fetch_well_rx_price.py - AttributeError: module 'typing' has no attribute 'no_type_check_decorator'
ERROR web_programming/get_amazon_product_data.py - AttributeError: module 'typing' has no attribute 'no_type_check_decorator'
ERROR web_programming/get_imdb_top_250_movies_csv.py - AttributeError: module 'typing' has no attribute 'no_type_check_decorator'
ERROR web_programming/instagram_crawler.py - AttributeError: module 'typing' has no attribute 'no_type_check_decorator'
ERROR web_programming/instagram_pic.py - AttributeError: module 'typing' has no attribute 'no_type_check_decorator'
ERROR web_programming/open_google_results.py - AttributeError: module 'typing' has no attribute 'no_type_check_decorator'
ERROR web_programming/random_anime_character.py - AttributeError: module 'typing' has no attribute 'no_type_check_decorator'
ERROR web_programming/world_covid19_stats.py - AttributeError: module 'typing' has no attribute 'no_type_check_decorator'

• Deprecate typing.no_type_check_decorator python/cpython#106309
• https://docs.python.org/3.15/whatsnew/3.15.html#id7

Let's fix those files in this PR to see if we can get our tests to pass.

[priya-sundaram-dev]

I dug into this one and I don't think the fix lives in those files — here's what I found:

• grep -rln no_type_check_decorator . across the whole repo returns nothing. None of our code references the removed symbol.
• All 10 failing modules share the same two third-party imports: httpx and bs4 (BeautifulSoup). That's the common denominator — every failing file imports both, and the AttributeError fires at import time, before any of our code runs.

So this is an upstream dependency reaching for typing.no_type_check_decorator, which 3.15 removed (python/cpython#106309). Editing our web_programming files won't clear it — we'd just be patching the messenger.

Two honest paths, and I'd like your call:

1. Pin/wait — identify the exact culprit in the httpx/bs4 dep tree and pin to a version that's 3.15-clean (or wait for its release). To pin it down precisely I'd add a one-line diagnostic to this DRAFT's job — python -Ic "import httpx, bs4" with full traceback — so CI prints the offending package + frame instead of just the summary line. That names the fix in one run.
2. Quarantine for now — --ignore=web_programming in the 3.15 job so the rest of the suite reports real 3.15 signal, then lift it once the dep ships a fix.

I lean (1) first to get the culprit's name on record (it's likely one shared transitive dep, so a single pin probably clears all 10), then (2) only if the fix isn't out yet. Want me to push the diagnostic import so we can see exactly which package it is?

[cclauss]

Please rebase to resolve the git conflicts.

Could no_type_check_decorator be hiding in a dependency? Httpx, which is under maintained? Should we swap out httpx for its replacement https://httpx2.pydantic.dev