mod: bump golang.org/x/tools from 0.27.0 to 0.28.0 #14951

Job	Run time
arch (presubmit_arch_linux)	10m 50s
build	13m 8s
aux	4m 54s
arch (presubmit_arch_freebsd)	6m 35s
arch (presubmit_arch_netbsd)	4m 24s
dashboard	3m 25s
arch (presubmit_arch_openbsd)	4m 20s
race	8m 10s
arch (presubmit_arch_darwin)	4m 19s
arch (presubmit_arch_windows)	3m 20s
race_dashboard	4m 46s
arch (presubmit_arch_executor)	3m 15s
gvisor	4m 14s
old	6m 35s
	1h 22m 15s

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