Summary

• Split out a small, low-conflict subset of the Python 3.15 stdlib changes.
• Add decimal SPEC_VERSION exports, asyncio updates, dbm reorganize support, pstats.Stats.print_call_subheading, and the 3.15 sysconfig.is_python_build signature.
• Remove cProfile.label for Python 3.15+.
• Remove corresponding 3.15 stubtest allowlist entries.

Relevant report entries

• Added asyncio.tools.display_awaited_by_tasks_table(retries=...) and display_awaited_by_tasks_tree(retries=...) (CPython source: https://github.com/python/cpython/blob/e81025e6d2e01e38c5a5b656af5739ac9df5ff55/Lib/asyncio/tools.py)
• Added asyncio.TaskGroup.cancel (CPython PR: gh-108951: add TaskGroup.cancel() cpython#127214; source: https://github.com/python/cpython/blob/main/Lib/asyncio/taskgroups.py)
• Removed undocumented cProfile.label from the 3.15 runtime surface (CPython source: https://github.com/python/cpython/blob/e81025e6d2e01e38c5a5b656af5739ac9df5ff55/Lib/cProfile.py)
• Added dbm.dumb._Database.reorganize, dbm.sqlite3.REORGANIZE, and dbm.sqlite3._Database.reorganize (CPython PRs: DBM Module Vacuuming cpython#134004, Custom unpickler and pickler for the shelve module  cpython#99631; sources: https://github.com/python/cpython/blob/main/Lib/dbm/dumb.py, https://github.com/python/cpython/blob/e81025e6d2e01e38c5a5b656af5739ac9df5ff55/Lib/dbm/sqlite3.py)
• Added decimal.SPEC_VERSION, _decimal.SPEC_VERSION, and _pydecimal.SPEC_VERSION (CPython source: https://github.com/python/cpython/blob/e81025e6d2e01e38c5a5b656af5739ac9df5ff55/Lib/_pydecimal.py, https://github.com/python/cpython/blob/e81025e6d2e01e38c5a5b656af5739ac9df5ff55/Modules/_decimal/_decimal.c)
• Added pstats.Stats.print_call_subheading() (CPython source: https://github.com/python/cpython/blob/e81025e6d2e01e38c5a5b656af5739ac9df5ff55/Lib/pstats.py)
• Removed the deprecated check_home parameter from sysconfig.is_python_build() (CPython source: https://github.com/python/cpython/blob/e81025e6d2e01e38c5a5b656af5739ac9df5ff55/Lib/sysconfig/__init__.py)