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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