resolves #3500 (BA-538)

aiotools release notes

• https://github.com/achimnol/aiotools/releases/tag/1.8.2
• https://github.com/achimnol/aiotools/releases/tag/1.8.1
• https://github.com/achimnol/aiotools/releases/tag/1.8.0

Typing fixes

• Use asyncio.Future instead of asyncio.Task to type the return value of aiotools.PersistentTaskGroup.create_task().
• Update our PersistentTaskGroup exception handlers to follow the new aiotools.AsyncExceptionHandler typing (Exception → BaseException).
• Use @aiotools.server_context instead of hacky module-callable @aiotools.server to satisfy mypy.
• Use intrinsic generics (list[...], dict[...], tuple[...]) and collections.abc generics for updated source files.

Typing fixes newly found by mypy in the affected source files

• Use typing.Self as the return type of the class builder method in common.events.AbstractEvent to resolve type mismatch of overridden methods.
• Fix inconsistent result typing of common.redis_helper.read_stream().
• Use explicit .decode() in string interpolation braces that refer bytes as mypy began to complain about potential mis-prints like b"xxx" instead of "xxx".
• Replace aiotools.aclosing with contextlib.aclosing (added in Python 3.10).

$ pants export --resolve=python-default
$ ./py -m pip install -e path/to/aiotools/working-copy
$ LOCKSET=mypy/3.12.8 python -m mypy src tests

Checklist: (if applicable)

• Milestone metadata specifying the target backport version
• Mention to the original issue