chore(renovate): Update slackapi/slack-github-action action to v4

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
slackapi/slack-github-action	action	major	v3.0.3 → v4.0.0

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Release Notes

slackapi/slack-github-action (slackapi/slack-github-action)

v4.0.0

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v3.0.5: Slack GitHub Action v3.0.5

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Patch Changes

• 96fddbe: fix: revert multiline yaml parsing indentation change

v3.0.4: Slack GitHub Action v3.0.4

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Patch Changes

• fa03fe4: refactor: send webhooks with the @slack/webhook package

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