roachtest: follower-reads/survival=region/locality=global/reads=bounded-staleness failed

[cockroach-teamcity]

Tracked in #70110.

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roachtest.follower-reads/survival=region/locality=global/reads=bounded-staleness failed with artifacts on release-21.2 @ 2ef24098cc88bab3958ad905f46b0ed7e74bd7db:

The test failed on branch=release-21.2, cloud=gce:
test artifacts and logs in: /home/agent/work/.go/src/github.com/cockroachdb/cockroach/artifacts/follower-reads/survival=region/locality=global/reads=bounded-staleness/run_1
	follower_reads.go:545,follower_reads.go:327,follower_reads.go:57,test_runner.go:777: 11 latency values ([20.971514ms 20.774906ms 20.447226ms 20.70937ms 22.34777ms 21.495802ms 22.02009ms 20.840442ms 20.971514ms 21.102586ms 20.316154ms]) are above target latency 20ms, 4 permitted

Reproduce

See: roachtest README

Same failure on other branches

• roachtest: follower-reads/survival=region/locality=global/reads=bounded-staleness failed #71126 roachtest: follower-reads/survival=region/locality=global/reads=bounded-staleness failed [C-test-failure O-roachtest O-robot branch-master]

/cc @cockroachdb/kv-triage

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