chore: dependency updates, related fixes#4711

Merged

mikehardy merged 6 commits intomasterfrom dependency-updates

Dec 28, 2020

+8,745-3,983

Commits on Dec 23, 2020

fix(ios): bump ios min deployment to ios10 - remnant from #4471
mikehardy
committed

Commits on Dec 27, 2020

test(firestore, e2e): de-flake more firestore tests
mikehardy
committed