mod: bump golang.org/x/oauth2 from 0.33.0 to 0.34.0 #18563

Job	Run time
dashboard	1m 58s
race	6m 54s
aux	4m 40s
old	7m 7s
build	4m 6s
race_dashboard	3m 50s
gvisor	3m 57s
arch (presubmit_arch_darwin)	3m 48s
arch (presubmit_arch_linux)	10m 45s
arch (presubmit_arch_freebsd)	6m 24s
arch (presubmit_arch_windows)	3m 45s
arch (presubmit_arch_executor)	3m 22s
arch (presubmit_arch_netbsd)	3m 54s
arch (presubmit_arch_openbsd)	3m 55s
	1h 8m 25s

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