chime service: fix race condition when not using `us-east-1` #9075

Job	Run time
Add Merged Pull Requests and Related Issues to Milestone	0s
Community Note	0s
Service Labeler	0s
Size Labeler	0s
New Contributor Note	0s
Community Check / Check community lists for username	2s
Automation Labeler	4s
Add to Project	2s
Verify Maintainers Editable	0s
	8s

Provide feedback