Update dependency laravel/slack-notification-channel to v3.4.0

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
laravel/slack-notification-channel	3.3.2 -> 3.4.0

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Release Notes

laravel/slack-notification-channel (laravel/slack-notification-channel)

### [`v3.4.0`](https://redirect.github.com/laravel/slack-notification-channel/blob/HEAD/CHANGELOG.md#v340---2024-10-24) [Compare Source](https://redirect.github.com/laravel/slack-notification-channel/compare/v3.3.2...v3.4.0) - Add support for using copied json from block kit builder by [@​princejohnsantillan](https://redirect.github.com/princejohnsantillan) in [https://github.com/laravel/slack-notification-channel/pull/98](https://redirect.github.com/laravel/slack-notification-channel/pull/98)

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