roachtest: cluster_creation failed

roachtest.cluster_creation [failed](https://teamcity.cockroachdb.com/buildConfiguration/Cockroach_Nightlies_Roachtests_RoachtestNightlyIbmBazel/21260484?buildTab=log) with [artifacts](https://teamcity.cockroachdb.com/buildConfiguration/Cockroach_Nightlies_Roachtests_RoachtestNightlyIbmBazel/21260484?buildTab=artifacts#/kv0/enc=false/nodes=3/cpu=96) on release-26.1 @ [95a4771368c0790a26239cb6be532865c8227967](https://github.com/cockroachdb/cockroach/commits/95a4771368c0790a26239cb6be532865c8227967):

```
test kv0/enc=false/nodes=3/cpu=96 failed: (test_runner.go:991).func4: invalid number of cpus 96 for IBM [owner=test-eng]
```

Parameters:
- cloud=ibm
- coverageBuild=false
- cpu=96
- diskCount=0
- runtimeAssertionsBuild=false
Help

See: [roachtest README](https://github.com/cockroachdb/cockroach/blob/master/pkg/cmd/roachtest/README.md)

See: [How To Investigate \(internal\)](https://cockroachlabs.atlassian.net/l/c/SSSBr8c7)

/cc @cockroachdb/test-eng

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Jira issue: CRDB-61637