Bump rules_go to v0.18.2 and go toolchain to v1.12.2.
Bump rules_go to v0.18.2 and go toolchain to v1.12.2.

PiperOrigin-RevId: 242493066
Change-Id: I2b2b590799d208895c5c16606e4f854dfd112dba

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