Bump DavidAnson/markdownlint-cli2-action from 17 to 18 (#745) #2394

Job	Run time
Build Benchmarks (w/ yoga)	1m 6s
Build Examples	1m 5s
Build [debug feature]	44s
Build Benchmarks	53s
MSRV Build [Rust 1.65]	2m 5s
Test Fixture Formatting	35s
Clippy	1m 23s
Documentation	50s
Rustfmt	10s
Markdown Lint	5s
Test Suite [alloc + all algorithms]	1m 33s
Test Suite [std + block)]	1m 32s
Test Suite [default features]	1m 43s
Test Suite [default except content_size]	1m 39s
Test Suite [std + flexbox]	1m 37s
Test Suite [default + serde]	1m 49s
Test Suite [std + grid]	1m 45s
Test Suite [alloc + no algorithms]	1m 45s
Test Suite [std (no algorithms)]	1m 36s
Test Suite [no features]	1m 27s
	25m 22s

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