chore(deps): update davidanson/markdownlint-cli2-action action to v18 #282

Job	Run time
Code Coverage (ubuntu-latest)	1m 48s
Style/format	10s
Code Coverage (macos-latest)	1m 46s
Style/lint (ubuntu-latest)	43s
Code Coverage (windows-latest)	3m 39s
Style/lint (macos-latest)	19s
Style/lint (windows-latest)	2m 50s
Style/spellcheck	11s
Build/Test (ubuntu-latest)	41s
Build/Test (macos-latest)	25s
Build/Test (windows-latest)	2m 7s
	14m 39s

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