Update Contacts for guava 27.1

Futures.transform now requires an Executor argument.

Futures.withFallback has been replaced with Futures.catchingAsync.

Bug: 130306229
Test: m checkbuild
Change-Id: I5ea7810446ed23b133e6dfb0eb06e6e10125db53
Merged-In: I5ea7810446ed23b133e6dfb0eb06e6e10125db53
Exempt-From-Owner-Approval: cherry pick
(cherry picked from commit a798701c)