bump PaymentServer to version exposing more info

Fixes privatestorageweb#226

This deploys https://github.com/PrivateStorageio/PaymentServer/pull/113 which adds the Stripe detailed error message to our error response. Our client-side form handling code already looks for the error message and will display it if it is there.

merged

mentioned in commit 2a1e5378

mentioned in merge request !286 (merged)