Update tests packages (major)

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
jsdom	28.1.0 → 29.0.2
nyc (source)	17.1.0 → 18.0.0
vite-plugin-istanbul	7.2.1 → 8.0.0

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Release Notes

jsdom/jsdom (jsdom)

v29.0.2

Compare Source

• Significantly improved and sped up getComputedStyle(). Computed value rules are now applied across a broader set of properties, and include fixes related to inheritance, defaulting keywords, custom properties, and color-related values such as currentcolor and system colors. (@​asamuzaK)
• Fixed CSS 'background' and 'border' shorthand parsing. (@​asamuzaK)

v29.0.1

Compare Source

v29.0.0

Compare Source

Breaking changes:

• Node.js v22.13.0+ is now the minimum supported v22 version (was v22.12.0+).

Other changes:

• Overhauled the CSSOM implementation, replacing the @acemir/cssom and cssstyle dependencies with fresh internal implementations built on webidl2js wrappers and the css-tree parser. Serialization, parsing, and API behavior is improved in various ways, especially around edge cases.
• Added CSSCounterStyleRule and CSSNamespaceRule to jsdom Windows.
• Added cssMediaRule.matches and cssSupportsRule.matches getters.
• Added proper media query parsing in MediaList, using css-tree instead of naive comma-splitting. Invalid queries become "not all" per spec.
• Added cssKeyframeRule.keyText getter/setter validation.
• Added cssStyleRule.selectorText setter validation: invalid selectors are now rejected.
• Added styleSheet.ownerNode, styleSheet.href, and styleSheet.title.
• Added bad port blocking per the fetch specification, preventing fetches to commonly-abused ports.
• Improved Document initialization performance by lazily initializing the CSS selector engine, avoiding ~0.5 ms of overhead per Document. (thypon)
• Fixed a memory leak when stylesheets were removed from the document.
• Fixed CSSStyleDeclaration modifications to properly trigger custom element reactions.
• Fixed nested @media rule parsing.
• Fixed CSSStyleSheet's "disallow modification" flag not being checked in all mutation methods.
• Fixed XMLHttpRequest's response getter returning parsed JSON during the LOADING state instead of null.
• Fixed getComputedStyle() crashing in XHTML documents when stylesheets contained at-rules such as @page or @font-face.
• Fixed a potential hang in synchronous XMLHttpRequest caused by a race condition with the worker thread's idle timeout.

istanbuljs/nyc (nyc)

v18.0.0

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⚠ BREAKING CHANGES

• deps: transitive dependencies now require node 20 || >=22.

Bug Fixes

• deps: update dependencies pulling in old glob (#​1612) (0707729)

iFaxity/vite-plugin-istanbul (vite-plugin-istanbul)

v8.0.0

Compare Source

• chore(deps)!: removed the upper range of vite peer (#​396) (17df98d)

Features

• update node v24.14.0 (#​377) (c60c931)

BREAKING CHANGES

• removed the upper range of the vite peer dependency.

• chore(pnpm): updated lockfile

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