Bump stripe/stripe-php from 13.12.0 to 13.13.0 (#919)

Bumps [stripe/stripe-php](https://github.com/stripe/stripe-php) from 13.12.0 to 13.13.0.
- [Release notes](https://github.com/stripe/stripe-php/releases)
- [Changelog](https://github.com/stripe/stripe-php/blob/master/CHANGELOG.md)
- [Commits](stripe/stripe-php@v13.12.0...v13.13.0)

---
updated-dependencies:
- dependency-name: stripe/stripe-php
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>