IssueTracker

If this is a bug in the library, we would appreciate if you could attach:
Fatal Exception: java.lang.IndexOutOfBoundsException: Index: 2, Size: 2
       at java.util.ArrayList.get(ArrayList.java:437)
       at androidx.fragment.app.FragmentStore.findFragmentByTag(FragmentStore.java:270)
       at androidx.fragment.app.FragmentManager.findFragmentByTag(FragmentManager.java:1830)
       at androidx.biometric.BiometricPrompt.findBiometricFragment(BiometricPrompt.java:1056)
       at androidx.biometric.BiometricPrompt.cancelAuthentication(BiometricPrompt.java:1009)

BUILD INFO
- OS version: Android 10 and above
- Biometric library version: 1.1.0

STEPS TO REPRODUCE
This seems to be very spurious and could not find exact steps to reproduce. But able to see crashes due to this.

EXPECTED RESULTS
When we programatically call `cancelAuthentication` when the biometric prompt is open we should dismiss the dialog without any crash

OBSERVED RESULTS
On performing `cancelAuthentication` the internal `findFragmentByTag` is checking over the size and when iteration when the dialog is dismissed before iteration completes, we will see crash