build(deps): bump js-yaml from 4.3.1 to 5.4.3 in /playground

[dependabot]

Bumps js-yaml from 4.3.1 to 5.4.3.

Changelog

Sourced from js-yaml's changelog.

[5.4.3] - 2026-10-06

Fixed

• Fixed loading a whitespace-only block scalar followed by a less indented line, #802.

[5.4.2] - 2026-09-13

Fixed

• forceQuotes no longer quotes non-string scalars, #798.

[5.4.1] - 2026-08-26

Changed

• Hard-limit merge sequence size to 100.

Security

• Count empty mappings in merge sequences toward maxTotalMergeKeys to limit CPU usage, #797.

[5.4.0] - 2026-08-25

Added

• Added the scalarStyleRules dumper option to customize string formatting. See Scalar styling for details.

Changed

• [breaking] Flattened the low-level AST node style representation. Scalar and collection nodes now use SCALAR_STYLE and COLLECTION_STYLE values; explicit tags use the separate tagged property. Alias nodes now contain only kind and anchor. This only affects code that directly constructs or edits AST nodes.
• [breaking] The sortKeys option was rewritten using AST mutation to avoid side effects.
• Reworked scalar style selection. This can change formatting without changing loaded values; in particular, whitespace-only strings are now double-quoted.

Fixed

• Accept a byte order mark at the start of each document in a stream, #791.
• Produce valid flow mappings with quoteFlowKeys and flowSkipColonSpace, including alias and property-only keys, #786.
• Preserve empty scalar items when converting block sequences to flow style.
• Do not apply the 1024-character simple-key limit to flow mapping keys.
• Count Unicode code points, rather than UTF-16 code units, for the 1024-character simple-key limit.
• Add an explicit document-end marker after keep-chomped block scalars when needed to preserve trailing newlines.

... (truncated)

Commits

• 7832624 5.4.3 released
• 0cbb471 Fix whitespace-only block scalar followed by a less indented line, close #802
• 30108cc Parse the first block mapping key once (#800)
• 494400b 5.4.2 released
• 6d8adb4 Fix forceQuotes quoting non-string scalars, #798
• e5a3ba0 5.4.1 released
• e54dea3 Hard-limit merge sequence size to 100
• dfd3a29 Cleanup 6a8e05f, #797
• 6a8e05f fix: count empty merge sources against maxTotalMergeKeys (#797)
• 6b4ff5e 5.4.0 released
• Additional commits viewable in compare view

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