Bump stripe-ruby-mock from 2.5.6 to 2.5.7
Bump stripe-ruby-mock from 2.5.6 to 2.5.7

Bumps [stripe-ruby-mock](https://github.com/rebelidealist/stripe-ruby-mock) from 2.5.6 to 2.5.7.
- [Release notes](https://github.com/rebelidealist/stripe-ruby-mock/releases)
- [Commits](https://github.com/rebelidealist/stripe-ruby-mock/compare/v2.5.6...v2.5.7)
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