Werk #13311: Update mod_auth_mellon to 0.18.0

Component	Other components
Title	Update mod_auth_mellon to 0.18.0
Date	Oct 12, 2021
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.1.0b1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

To the list of all Werks