We have officially announced the L-2 version support policy for WooCommerce and WordPress core since May 2021.
As a contributor to WooCommerce Stripe Payment Gateway, you should be mindful when adding new features and functionalities to your PRs as your code needs to work within proper ranges of WordPress and WooCommerce versions. Although we have a CI workflow to check the compatibility between the Stripe extension and these ranges, it's still good for contributors to be aware of this policy.