mod: bump cloud.google.com/go/batch from 1.11.5 to 1.12.1 #569

Job	Run time
aux	3m 24s
build	1d 0h 0m 0s
old	7m 3s
gvisor	3m 32s
dashboard	1s
race	1s
arch (presubmit_arch_freebsd)	6m 10s
race_dashboard	1s
arch (presubmit_arch_linux)	10m 30s
arch (presubmit_arch_openbsd)	3m 33s
arch (presubmit_arch_windows)	3m 26s
arch (presubmit_arch_darwin)	3m 34s
arch (presubmit_arch_executor)	3m 1s
arch (presubmit_arch_netbsd)	3m 36s
	1d 0h 47m 52s

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