Add missing payment_method_details to stripe.rbi

[Tonkpils]

Type of Change

• [ ] Add RBI for a new gem
• [x] Modify RBI for an existing gem
• [ ] Other:

Changes

Stripe Charges respond to payment_method_details which returns a StripeObject that responds to different methods depending on the type returned https://docs.stripe.com/api/charges/object#charge_object-payment_method_details

• Gem name: stripe
• Gem version: 8.7.0
• Gem source: https://github.com/stripe/stripe-ruby/tree/v8.7.0
• Gem API doc: https://docs.stripe.com/api/charges/object#charge_object-payment_method_details
• Tapioca version: 0.12.0
• Sorbet version: 0.5.11284

[Tonkpils]

Turning this back to draft since Sorbet complains about this at runtime since the object returned by payment_method_details.card is a Stripe::StripeObject and not a Stripe::Card 😬