Replace typing.optional with new annotations syntax (#5829)
* Replace typing.optional with new annotations syntax
* updating DIRECTORY.md
Co-authored-by: github-actions <${GITHUB_ACTOR}@users.noreply.github.com> C
Christian Clauss committed
1ae5abfc3ca5dcf89b7e378735ceb9ef41769cbf
Parent: d848bfb
Committed by GitHub <noreply@github.com>
on 11/17/2021, 3:43:02 AM