fix(deps): update module github.com/slack-go/slack to v0.8.1

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
github.com/slack-go/slack	require	patch	v0.8.0 -> v0.8.1

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Release Notes

slack-go/slack

### [`v0.8.1`](https://togithub.com/slack-go/slack/releases/v0.8.1) [Compare Source](https://togithub.com/slack-go/slack/compare/v0.8.0...v0.8.1) Thank you for all the contributions! ##### Fixes - Reminders list fix [#​865](https://togithub.com/slack-go/slack/issues/865) by [@​KarolisKl](https://togithub.com/KarolisKl) ##### Features - Add MaxSelectedItems field to MultiSelectBlockElement [#​836](https://togithub.com/slack-go/slack/issues/836) by [@​shiwano](https://togithub.com/shiwano) - Add support for emoji_changed event [#​890](https://togithub.com/slack-go/slack/issues/890) by [@​ToshihitoKon](https://togithub.com/ToshihitoKon) - Add `dispatch_action` to input blocks [#​893](https://togithub.com/slack-go/slack/issues/893) by [@​evnsio](https://togithub.com/evnsio) - Create a validation function to check TextBlockObject values [#​895](https://togithub.com/slack-go/slack/issues/895) by [@​sryoya](https://togithub.com/sryoya)

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