Describe the problem

The test has failed multiple times in the past day alone (4)
https://teamcity.cockroachdb.com/buildConfiguration/Cockroach_UnitTests_BazelUnitTests/7547458?showRootCauses=true&expandBuildChangesSection=true&expandBuildDeploymentsSection=true&expandBuildTestsSection=true
https://teamcity.cockroachdb.com/buildConfiguration/Cockroach_UnitTests_BazelUnitTests/7549322?showRootCauses=true&expandBuildChangesSection=true&expandBuildDeploymentsSection=true&expandBuildProblemsSection=true&expandBuildTestsSection=true

Marking flaky for now to allow investigation.

Jira issue: CRDB-21515