Bump DavidAnson/markdownlint-cli2-action from 17 to 18 #2393

Job	Run time
Build Benchmarks	54s
Build Examples	1m 1s
Build Benchmarks (w/ yoga)	1m 40s
Build [debug feature]	32s
MSRV Build [Rust 1.65]	2m 9s
Clippy	1m 26s
Documentation	48s
Test Fixture Formatting	32s
Rustfmt	6s
Markdown Lint	3s
Test Suite [alloc + all algorithms]	1m 36s
Test Suite [std + block)]	1m 35s
Test Suite [default features]	1m 29s
Test Suite [default except content_size]	1m 42s
Test Suite [default + serde]	1m 41s
Test Suite [std + flexbox]	1m 35s
Test Suite [std + grid]	1m 31s
Test Suite [alloc + no algorithms]	1m 38s
Test Suite [std (no algorithms)]	1m 29s
Test Suite [no features]	1m 31s
	24m 58s

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