Update dependency laravel/horizon to v5.9.6

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
laravel/horizon	require	patch	5.9.4 -> 5.9.6

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Release Notes

laravel/horizon

### [`v5.9.6`](https://togithub.com/laravel/horizon/blob/HEAD/CHANGELOG.md#v596-httpsgithubcomlaravelhorizoncomparev595v596---2022-04-07) [Compare Source](https://togithub.com/laravel/horizon/compare/v5.9.5...v5.9.6) ##### Fixed - Revert "Make horizon work with strict content-security-policy" by [@​driesvints](https://togithub.com/driesvints) in [https://github.com/laravel/horizon/pull/1141](https://togithub.com/laravel/horizon/pull/1141) ### [`v5.9.5`](https://togithub.com/laravel/horizon/blob/HEAD/CHANGELOG.md#v595-httpsgithubcomlaravelhorizoncomparev594v595---2022-03-31) [Compare Source](https://togithub.com/laravel/horizon/compare/v5.9.4...v5.9.5) ##### Changed - Make horizon work with strict content-security-policy by [@​Grldk](https://togithub.com/Grldk) in [https://github.com/laravel/horizon/pull/1138](https://togithub.com/laravel/horizon/pull/1138) ##### Fixed - Fix for table headers in the Monitoring tab to match the data that is presented to the user by [@​dylan7778](https://togithub.com/dylan7778) in [https://github.com/laravel/horizon/pull/1137](https://togithub.com/laravel/horizon/pull/1137)

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