chore: Bump laravel/cashier from 12.6.1 to 12.6.3 (#4824)

Bumps [laravel/cashier](https://github.com/laravel/cashier-stripe) from 12.6.1 to 12.6.3.
- [Release notes](https://github.com/laravel/cashier-stripe/releases)
- [Changelog](https://github.com/laravel/cashier-stripe/blob/12.x/CHANGELOG.md)
- [Commits](laravel/cashier-stripe@v12.6.1...v12.6.3)

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