[native] [34/40] RN 0.70: Update to react-native-gesture-handler@2.8.0

Summary: This wasn't strictly necessary, but npx @rnx-kit/dep-check --write recommended updating, and we were on an ancient version.

Test Plan:

1. I reviewed the Release Notes and found no breaking changes that might affect us, other than the ones updated here
2. Tested along with whole stack: test plan (includes testing gestures)
3. Manually tested SwipeableThread since it imports Swipeable from RNGH which is poorly supported and had some changes noted in the breaking changes list

Depends on D5934

Reviewers: tomek, bartek

Subscribers: atul

Differential Revision: https://phab.comm.dev/D5935