mod: bump google.golang.org/grpc from 1.76.0 to 1.77.0 #18417

Job	Run time
build	4m 21s
dashboard	1m 57s
aux	4m 51s
arch (presubmit_arch_linux)	10m 45s
arch (presubmit_arch_freebsd)	6m 26s
arch (presubmit_arch_openbsd)	3m 42s
arch (presubmit_arch_darwin)	3m 45s
arch (presubmit_arch_windows)	3m 10s
arch (presubmit_arch_netbsd)	3m 31s
arch (presubmit_arch_executor)	3m 20s
race	7m 6s
race_dashboard	3m 1s
old	7m 7s
gvisor	3m 59s
	1h 7m 1s

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