.github/workflows: address breaking changes to `slack-github-action`

[jar-b]

Description

The webhook-type argument is now required. The webhook argument is optional and can also be configured by setting the SLACK_WEBHOOK_URL environment variable, but I've migrated to the explicit argument to align with the documentation for the release. See the release notes for complete details on the breaking changes.

Relations

Relates #40160

References

• https://github.com/slackapi/slack-github-action/releases/tag/v2.0.0

[github-actions[bot]]

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[github-actions[bot]]

This functionality has been released in v5.77.0 of the Terraform AWS Provider. Please see the Terraform documentation on provider versioning or reach out if you need any assistance upgrading.

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