mod: bump google.golang.org/api from 0.252.0 to 0.256.0 #18377

Job	Run time
aux	4m 13s
race	6m 55s
race_dashboard	3m 0s
build	3m 11s
arch (presubmit_arch_linux)	11m 0s
arch (presubmit_arch_netbsd)	3m 49s
dashboard	2m 27s
arch (presubmit_arch_freebsd)	6m 30s
arch (presubmit_arch_darwin)	3m 31s
arch (presubmit_arch_windows)	3m 36s
old	7m 22s
arch (presubmit_arch_executor)	3m 17s
arch (presubmit_arch_openbsd)	4m 2s
gvisor	4m 5s
	1h 6m 58s

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