CI: Bump DavidAnson/markdownlint-cli2-action from 20 to 21

[dependabot[bot]]

Bumps DavidAnson/markdownlint-cli2-action from 20 to 21.

Release notes

Sourced from DavidAnson/markdownlint-cli2-action's releases.

Update markdownlint version (markdownlint-cli2 v0.19.0, markdownlint v0.39.0).

No release notes provided.

Update markdownlint version (markdownlint-cli2 v0.18.1, markdownlint v0.38.0).

No release notes provided.

Update markdownlint version (markdownlint-cli2 v0.17.2, markdownlint v0.37.4).

No release notes provided.

Update markdownlint version (markdownlint-cli2 v0.17.0, markdownlint v0.37.0).

No release notes provided.

Update markdownlint version (markdownlint-cli2 v0.15.0, markdownlint v0.36.1).

No release notes provided.

Update markdownlint version (markdownlint-cli2 v0.14.0, markdownlint v0.35.0).

No release notes provided.

Update markdownlint version (markdownlint-cli2 v0.13.0, markdownlint v0.34.0).

No release notes provided.

Update markdownlint version (markdownlint-cli2 v0.12.1, markdownlint v0.33.0).

Update markdownlint version (markdownlint-cli2 v0.11.0, markdownlint v0.32.1), remove deprecated "command" input.

No release notes provided.

Update markdownlint version (markdownlint-cli2 v0.10.0, markdownlint v0.31.1).

No release notes provided.

Update markdownlint version (markdownlint-cli2 v0.9.2, markdownlint v0.30.0).

No release notes provided.

Update markdownlint version (markdownlint-cli2 v0.8.1, markdownlint v0.29.0), add "config" and "fix" inputs, deprecate "command" input.

No release notes provided.

Update markdownlint version (markdownlint-cli2 v0.7.1, markdownlint v0.28.2).

No release notes provided.

Update markdownlint version (markdownlint-cli2 v0.7.0, markdownlint v0.28.1), include link to rule information in title of annotations (clickable in GitHub).

No release notes provided.

Update markdownlint version (markdownlint-cli2 v0.6.0, markdownlint v0.27.0).

No release notes provided.

Update markdownlint version (markdownlint-cli2 v0.5.1, markdownlint v0.26.2).

No release notes provided.

Update markdownlint version (markdownlint-cli2 v0.4.0, markdownlint v0.25.1)

No release notes provided.

Commits

• 30a0e04 Update to version 21.0.0.
• 6d4a055 Freshen generated index.js file.
• d9bf3fb Bump markdownlint-cli2 from 0.18.1 to 0.19.0
• 29b4789 Bump @​eslint/js from 9.39.0 to 9.39.1
• 6d600f1 Bump eslint from 9.39.0 to 9.39.1
• 15b21a0 Bump @​eslint/js from 9.38.0 to 9.39.0
• b259d54 Bump eslint from 9.38.0 to 9.39.0
• 451cad2 Bump eslint-plugin-unicorn from 61.0.2 to 62.0.0
• c076bbe Bump @​stylistic/eslint-plugin from 5.4.0 to 5.5.0
• ef464f4 Bump @​eslint/js from 9.37.0 to 9.38.0
• Additional commits viewable in compare view

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