Update DavidAnson/markdownlint-cli2-action action to v13 #206

Job	Run time
Style/format	24s
Build/Test (ubuntu-latest)	31s
Build/Test (macos-latest)	1m 9s
Style/spellcheck	7s
Build/Test (windows-latest)	1m 41s
Code Coverage (ubuntu-latest)	3m 17s
Code Coverage (macos-latest)	5m 32s
Style/lint (ubuntu-latest)	33s
Style/lint (macos-latest)	52s
Code Coverage (windows-latest)	7m 23s
Style/lint (windows-latest)	1m 17s
	22m 46s

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