Update dependency laravel/sanctum to v2.15.1

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
laravel/sanctum	require	patch	2.15.0 -> 2.15.1

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Release Notes

laravel/sanctum

### [`v2.15.1`](https://togithub.com/laravel/sanctum/blob/HEAD/CHANGELOG.md#v2151-httpsgithubcomlaravelsanctumcomparev2150v2151---2022-04-08) [Compare Source](https://togithub.com/laravel/sanctum/compare/v2.15.0...v2.15.1) ##### Changed - Added custom auth token header support by [@​CodesignDev](https://togithub.com/CodesignDev) in [https://github.com/laravel/sanctum/pull/354](https://togithub.com/laravel/sanctum/pull/354)

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Configuration

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