Error: "Unable to launch more VMs – maximum reached"

[spencertransier]

I've seen this happen a couple times. Looks like the VMs sometimes aren't being fully shut down at the end of a build.

Example build: https://buildkite.com/automattic/day-one-ios/builds/17783#018de6e2-c4bb-489d-b93b-b8ea9fb8292d/130-131

[AliSoftware]

Another example: https://a8c.slack.com/archives/C020Q0Z579V/p1708429128419219