Werk #13391: Remove support for IE 11

Component	User interface
Title	Remove support for IE 11
Date	Feb 3, 2022
Level	Trivial Change
Class	New Feature
Compatibility	Incompatible - Manual interaction might be required
Checkmk versions & editions	2.1.0b1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

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