Update workhorse dependency
What does this MR do and why?
Contributes to #350513
It updates Workhorse dependency (github.com/microcosm-cc/bluemonday) from v1.0.2 -> v1.0.18 (changes: https://github.com/microcosm-cc/bluemonday/compare/v1.0.2...v1.0.18)
MR acceptance checklist
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