fix(typing): update types to be compatible with latest mypy (backport #4234)

[mergify]

This is an automatic backport of pull request #4234 done by Mergify.
Cherry-pick of 5140de4 has failed:

On branch mergify/bp/0.x/pr-4234
Your branch is up to date with 'origin/0.x'.

You are currently cherry-picking commit 5140de46.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Changes to be committed:
	modified:   ddtrace/internal/atexit.py
	modified:   ddtrace/internal/runtime/runtime_metrics.py
	modified:   ddtrace/internal/writer.py
	modified:   ddtrace/profiling/collector/_lock.py
	modified:   ddtrace/profiling/collector/memalloc.py
	modified:   ddtrace/profiling/exporter/http.py
	modified:   ddtrace/profiling/profiler.py
	modified:   ddtrace/profiling/scheduler.py

Unmerged paths:
  (use "git add/rm <file>..." as appropriate to mark resolution)
	deleted by us:   ddtrace/debugging/_debugger.py
	both modified:   ddtrace/internal/utils/cache.py
	both modified:   ddtrace/profiling/collector/__init__.py
	deleted by us:   ddtrace/profiling/collector/asyncio.py

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/github/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

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