Werk #13450: apt: Fix APT Ubuntu security updates classification

Component	Checks & agents
Title	apt: Fix APT Ubuntu security updates classification
Date	Nov 16, 2021
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.1.0b1 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT 2.0.0p16 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

Some APT updates were incorrectly classified as normal instead of security. This also led to the wrong monitoring state, WARN instead of CRIT.

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