Update dependency laravel/sanctum to v2.15.0

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
laravel/sanctum	require	minor	2.14.2 -> 2.15.0

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Release Notes

laravel/sanctum

### [`v2.15.0`](https://togithub.com/laravel/sanctum/blob/HEAD/CHANGELOG.md#v2150-httpsgithubcomlaravelsanctumcomparev2142v2150---2022-03-28) [Compare Source](https://togithub.com/laravel/sanctum/compare/v2.14.2...v2.15.0) ##### Added - Add sanctum:prune-expired command for removing expired tokens. by [@​yuraplohov](https://togithub.com/yuraplohov) in [https://github.com/laravel/sanctum/pull/348](https://togithub.com/laravel/sanctum/pull/348) ##### Fixed - Add exit codes to command by [@​driesvints](https://togithub.com/driesvints) in [https://github.com/laravel/sanctum/pull/351](https://togithub.com/laravel/sanctum/pull/351)

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