[native] Bump @react-navigation/native to 5.9.8

Summary:
Downstream dependencies have issues surfaced by yarn audit

Went through the releases page: https://github.com/react-navigation/react-navigation/releases and looked specifically at @react-navigation/native releases between 5.8.9 (what we used to have) and 5.9.8 (what we're moving to in this diff) and there didn't seem to be any breaking changes... just bug fixes.

Figured going up a major version would be more involved, so stuck to 5.x. There's a task in Linear to upgrade React Navigation "further" (https://linear.app/comm/issue/ENG-336/try-upgrading-react-navigation-versions).

Depends on D3861

Test Plan: CI

Reviewers: def-au1t, palys-swm, ashoat

Reviewed By: ashoat

Subscribers: Adrian, karol-bisztyga, yayabosh

Differential Revision: https://phabricator.ashoat.com/D3863