[shreyans-chowdry]

Custom stop functions are accepted by Retrying(stop=...) and work at runtime inside stop_any and stop_all, but the two combinator constructors only annotate stop_base. This makes otherwise valid combinations fail type checking.

Use the existing StopBaseT alias for their arguments, consistent with BaseRetrying. The regression test combines a typed custom attempt-limit function with stop_after_delay, checks both combinators' results, and is included in the repository mypy run. Before the annotation change, mypy reports two argument-type errors in that test. Afterward it passes; runtime behavior is unchanged.

Validation on Python 3.12.4/macOS:

• Full suite: 186 passed, 15 subtests passed.
• Repository mypy and Ruff lint/format: pass.
• Strict Sphinx doctests: 35 passed.
• Strict Sphinx HTML build: passes.

Includes a release note. Investigated, implemented, and tested with OpenAI Codex assistance; found during source review, not a production incident.

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