Bump rules_go to v0.20.0 and gazelle to v0.19.0
Bump rules_go to v0.20.0 and gazelle to v0.19.0

PiperOrigin-RevId: 274673485

google/gvisor,google/gvisor,google/gvisor,google/gvisor,google/gvisor,google/gvisor,google/gvisor,google/gvisor