fix: use python3.8 compatible typing

[bhearsum]

No description provided.

[bhearsum]

I guess we don't run checks against 3.8 here...but over in https://firefox-ci-tc.services.mozilla.com/tasks/A54t9llXTOO0joPcT2VKAA/runs/0/logs/live/public/logs/live.log we're seeing this:

[task 2025-05-28T14:47:00.532Z] Traceback (most recent call last):
[task 2025-05-28T14:47:00.532Z]   File "/builds/worker/checkouts/vcs/.tox/py38/bin/pytest", line 8, in <module>
[task 2025-05-28T14:47:00.532Z]     sys.exit(console_main())
[task 2025-05-28T14:47:00.532Z]   File "/builds/worker/checkouts/vcs/.tox/py38/lib/python3.8/site-packages/_pytest/config/__init__.py", line 201, in console_main
[task 2025-05-28T14:47:00.532Z]     code = main()
[task 2025-05-28T14:47:00.532Z]   File "/builds/worker/checkouts/vcs/.tox/py38/lib/python3.8/site-packages/_pytest/config/__init__.py", line 156, in main
[task 2025-05-28T14:47:00.532Z]     config = _prepareconfig(args, plugins)
[task 2025-05-28T14:47:00.532Z]   File "/builds/worker/checkouts/vcs/.tox/py38/lib/python3.8/site-packages/_pytest/config/__init__.py", line 341, in _prepareconfig
[task 2025-05-28T14:47:00.532Z]     config = pluginmanager.hook.pytest_cmdline_parse(
[task 2025-05-28T14:47:00.532Z]   File "/builds/worker/checkouts/vcs/.tox/py38/lib/python3.8/site-packages/pluggy/_hooks.py", line 513, in __call__
[task 2025-05-28T14:47:00.532Z]     return self._hookexec(self.name, self._hookimpls.copy(), kwargs, firstresult)
[task 2025-05-28T14:47:00.532Z]   File "/builds/worker/checkouts/vcs/.tox/py38/lib/python3.8/site-packages/pluggy/_manager.py", line 120, in _hookexec
[task 2025-05-28T14:47:00.532Z]     return self._inner_hookexec(hook_name, methods, kwargs, firstresult)
[task 2025-05-28T14:47:00.532Z]   File "/builds/worker/checkouts/vcs/.tox/py38/lib/python3.8/site-packages/pluggy/_callers.py", line 139, in _multicall
[task 2025-05-28T14:47:00.532Z]     raise exception.with_traceback(exception.__traceback__)
[task 2025-05-28T14:47:00.532Z]   File "/builds/worker/checkouts/vcs/.tox/py38/lib/python3.8/site-packages/pluggy/_callers.py", line 122, in _multicall
[task 2025-05-28T14:47:00.532Z]     teardown.throw(exception)  # type: ignore[union-attr]
[task 2025-05-28T14:47:00.532Z]   File "/builds/worker/checkouts/vcs/.tox/py38/lib/python3.8/site-packages/_pytest/helpconfig.py", line 105, in pytest_cmdline_parse
[task 2025-05-28T14:47:00.532Z]     config = yield
[task 2025-05-28T14:47:00.532Z]   File "/builds/worker/checkouts/vcs/.tox/py38/lib/python3.8/site-packages/pluggy/_callers.py", line 103, in _multicall
[task 2025-05-28T14:47:00.532Z]     res = hook_impl.function(*args)
[task 2025-05-28T14:47:00.532Z]   File "/builds/worker/checkouts/vcs/.tox/py38/lib/python3.8/site-packages/_pytest/config/__init__.py", line 1140, in pytest_cmdline_parse

[jcristau]

Should we add some level of 3.8 testing here?

[jcristau]

Replying to myself, since we're close to replacing the old mac signers, maybe not.