chore: update paykit to the pubky 0.14 release #1356

Twin: synonymdev/bitkit-ios#815
Refs: pubky/paykit-rs#165

Problem or use case

Paykit moves to Pubky 0.14 before Bitkit releases Paykit, building on its Pubky 0.12 and Pubky Noise rc10 upgrade (pubky/paykit-rs#165). This goes into 2.6.0, because doing it after the release needs a complex migration.

Proposed solution

Once a Paykit release on Pubky 0.14 is published, update Bitkit to that release.