mod: bump google.golang.org/grpc from 1.76.0 to 1.77.0 #18374

Job	Run time
build	3m 27s
dashboard	2m 39s
arch (presubmit_arch_linux)	10m 39s
arch (presubmit_arch_freebsd)	6m 26s
arch (presubmit_arch_netbsd)	3m 53s
arch (presubmit_arch_openbsd)	3m 43s
arch (presubmit_arch_darwin)	3m 49s
arch (presubmit_arch_executor)	3m 1s
arch (presubmit_arch_windows)	3m 43s
gvisor	3m 52s
race_dashboard	2m 58s
race	7m 8s
old	7m 38s
aux	4m 35s
	1h 7m 31s

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