mod: bump google.golang.org/grpc from 1.76.0 to 1.77.0 #18373

Job	Run time
aux	4m 42s
build	4m 7s
dashboard	2m 4s
race_dashboard	2m 53s
race	6m 55s
arch (presubmit_arch_openbsd)	3m 52s
arch (presubmit_arch_freebsd)	6m 22s
arch (presubmit_arch_linux)	10m 53s
arch (presubmit_arch_windows)	3m 37s
arch (presubmit_arch_darwin)	3m 46s
arch (presubmit_arch_netbsd)	3m 51s
arch (presubmit_arch_executor)	3m 19s
old	7m 9s
gvisor	3m 57s
	1h 7m 27s

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