security/dyncert: TestManager failed

security/dyncert.TestManager [failed](https://teamcity.cockroachdb.com/buildConfiguration/Cockroach_Ci_TestsAwsLinuxArm64_UnitTests/21292433?buildTab=log) with [artifacts](https://teamcity.cockroachdb.com/buildConfiguration/Cockroach_Ci_TestsAwsLinuxArm64_UnitTests/21292433?buildTab=artifacts#/) on master @ [06e48102c52233df51077b34e026b9254eb4321b](https://github.com/cockroachdb/cockroach/commits/06e48102c52233df51077b34e026b9254eb4321b):

```
=== RUN TestManager
--- FAIL: TestManager (1.15s)
=== RUN TestManager/SIGHUP_reloads_certs
I260331 23:40:15.936157 10 1@security/dyncert/manager.go:61 [-] 4 received signal "hangup", triggering certificate reload
manager_test.go:200:
Error Trace: pkg/security/dyncert/manager_test.go:200
Error: Condition never satisfied
Test: TestManager/SIGHUP_reloads_certs
I260331 23:40:15.936292 10 1@util/log/event_log.go:90 [-] 5 ={"Timestamp":1775000415936290350,"EventType":"certs_reload","Success":true}
I260331 23:40:15.936305 13 1@security/dyncert/manager.go:61 [-] 6 received signal "hangup", triggering certificate reload
I260331 23:40:15.936344 6 1@util/log/log_flush.go:148 [-] 7 hangup received, flushing logs
I260331 23:40:17.048110 13 1@util/log/event_log.go:90 [-] 8 ={"Timestamp":1775000417048105720,"EventType":"certs_reload","Success":true}
--- FAIL: TestManager/SIGHUP_reloads_certs (1.12s)
```
Help

See also: [How To Investigate a Go Test Failure \(internal\)](https://cockroachlabs.atlassian.net/l/c/HgfXfJgM)

/cc @cockroachdb/security-engineering

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Jira issue: CRDB-62278