chore: bump stripe-android to 20.6.+

[charliecruzan-stripe]

Summary

This bumps 4 things:

• stripe-android (from 20.5.+ to 20.6.+)
• the compileSdkVersion (from 31 to 32)
• the android gradle plugin (from 7.0.4 to 7.2.1)
• the kotlin version (1.6.10 to 1.6.21)

the compileSdkVersion bump isn't technically considered a "breaking change" for Android libraries, as it should be possible to bump it without causing any issues with your app, and Google recommends always developing against the latest version. That being said, this change should be published in a new minor version.

Motivation

get some bug fixes available in the latest stripe-android version

Testing

• [x] I tested this manually
• [ ] I added automated tests

Documentation

Select one:

• [ ] I have added relevant documentation for my changes.
• [x] This PR does not result in any developer-facing changes.