pkg/common/utils.go: update regionalLocationFmt for Europe with 10+ regions

GCP now offers more than 10 regions in Europe. Update the regex accordingly.

Author: JordanP

pkg/common/utils.go

@@ -71,7 +71,7 @@ const (
 	// Example: us
 	multiRegionalLocationFmt = "^[a-z]+$"
 	// Example: us-east1
-	regionalLocationFmt = "^[a-z]+-[a-z]+[0-9]$"
+	regionalLocationFmt = "^[a-z]+-[a-z]+[0-9]+$"
 
 	// Full or partial URL of the machine type resource, in the format:
 	//   zones/zone/machineTypes/machine-type