Werk #13645: NagVis: Updated to 1.9.31

Component	Other components
Title	NagVis: Updated to 1.9.31
Date	Apr 7, 2022
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.2.0b1 Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Ultimate MT 2.1.0b5 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT 2.0.0p23 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

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