Werk #17175: slack: Enforce HTTPS URLs

Component	Notifications
Title	slack: Enforce HTTPS URLs
Date	Jul 30, 2024
Level	Trivial Change
Class	Bug Fix
Compatibility	Incompatible - Manual interaction might be required
Checkmk versions & editions	2.4.0b1 Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Cloud, Checkmk Ultimate MT

The Webhook URL for Slack notifications must now use HTTPS. Please update your notification rules for slack.

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