[Mobile Payments] Update Tap on Mobile requirements to iOS 16.0

[joshheald]

    > **EDIT**: The [public docs](https://stripe.com/docs/terminal/payments/setup-reader/tap-to-pay-on-iphone#supported-devices) mention iOS 16.0 as a requirement

Hmm... I thought I took that requirement list from Stripe's docs, but perhaps it changed since then. I'll update some things to reflect iOS 16 and use Stripe's checking method rather than Apple's (which we currently do, so you only see the TTPoI button if Apple say your device supports it.)

Thanks for testing with the (expected) minimum hardware!

Originally posted by @joshheald in #8312 (comment)

We should check for the minimum OS requirements before displaying the option to select the TTPoI path.

This can be done using the method which Stripe's SDK provides.

Additionally, this will check whether the device supports the feature: e.g. we currently offer it on iPad, which does not support TTPoI.