`CircleCI`: changed iOS 12/13 to use Xcode 13 (#1918)
`CircleCI`: changed iOS 12/13 to use Xcode 13 (#1918)

Looks like this broke in #1909. Not sure why it's not finding those
simulators, but we can just run those old versions with an older Xcode
for now.
RevenueCat/purchases-ios,RevenueCat/purchases-ios,RevenueCat/purchases-ios,RevenueCat/purchases-ios,RevenueCat/purchases-ios