iOS 14.2+ crashes with multiple AR play sessions

@mfuad after trying this fix, we no longer experience this issue. My team is currently conducting additional tests but it seems like it fixed the issue. UnityWebRequests on iOS sometimes get stuck indefinitely even with timeout set page-3#post-6724693

Not really a great fix since I have to change the mm file post build. I don’t know if Unity will be investigating further to see if something else is going on under the hood. Seems odd that it only started happening after iOS 14.2.