chore(deps-dev): Update stylelint requirement from ^16.6.1 to ^16.21.1

[dependabot]

Updates the requirements on stylelint to permit the latest version.

Release notes

Sourced from stylelint's releases.

16.21.1

It fixes 3 bugs.

• Fixed: unexpected change of syntax in computed EditInfo (#8638) (@​romainmenke).
• Fixed: function-linear-gradient-no-nonstandard-direction false positives for CSS variables' names containing a direction substring (#8643) (@​Solomon-mithra).
• Fixed: media-feature-range-notation autofix for exact values (#8651) (@​romainmenke).

Changelog

Sourced from stylelint's changelog.

16.21.1 - 2025-07-03

It fixes 3 bugs.

• Fixed: unexpected change of syntax in computed EditInfo (#8638) (@​romainmenke).
• Fixed: function-linear-gradient-no-nonstandard-direction false positives for CSS variables' names containing a direction substring (#8643) (@​Solomon-mithra).
• Fixed: media-feature-range-notation autofix for exact values (#8651) (@​romainmenke).

16.21.0 - 2025-06-19

It rounds out the message secondary option and marks it as stable, adds 1 new option to a rule, and fixes 4 bugs.

• Added: non-experimental support for functional message secondary option (#8595) (@​ybiquitous).
• Added: ignore: ["after-custom-property"] to custom-property-empty-line-before (#8627) (@​imkesin).
• Fixed: cache configuration property not being respected (#8599) (@​ybiquitous).
• Fixed: fastest-levenshtein import when bundling (#8621) (@​onigoetz).
• Fixed: named-grid-areas-no-invalid false positives for interpolated grid-template-areas in CSS-in-JS (#8606) (@​shahana308).
• Fixed: selector-pseudo-*-no-unknown false positives for the missing form control styling selectors (#8623) (@​tyrann0us).

16.20.0 - 2025-05-29

It fixes 2 bugs with the built-in rules.

• Fixed: function-url-no-scheme-relative false negatives for @import (#8576) (@​pamelalozano16).
• Fixed: shorthand-property-no-redundant-values false negatives for additional radius (#8539) (@​ryo-manba).

16.19.1 - 2025-04-25

It fixes 1 bug with the no-empty-source rule.

• Fixed: no-empty-source false positives for non-standard syntaxes (#8548) (@​ybiquitous).

16.19.0 - 2025-04-23

It adds 2 options to 2 rules and fixes 3 bugs.

• Added: exceptWithoutPropertyFallback: [] to function-allowed-list (#8488) (@​ryo-manba).
• Added: ignore: ["four-into-three-edge-values"] to shorthand-property-no-redundant-values (#8527) (@​ryo-manba).
• Fixed: compact formatter with pnpm to newline the exit code (#8534) (@​konomae).
• Fixed: declaration-property-value-no-unknown range and message for invalid syntax within known functions (#8528) (@​ryo-manba).
• Fixed: no-empty-source false positives for --report-needless-disables (#8536) (@​romainmenke).

16.18.0 - 2025-04-06

It adds 2 new rules and fixes 2 bugs. We've turned on these rules, and the syntax-string-no-invalid and layer-name-pattern ones from recent releases, in our standard config.

• Added: color-function-alias-notation rule (#8499) (@​EduardAkhmetshin).
• Added: container-name-pattern rule (#8498) (@​nate10j).
• Fixed: declaration-property-value-no-unknown false positives for math of font-size (#8495) (@​otomad).
• Fixed: font-family-no-missing-generic-family-keyword false positives for math (#8489) (@​otomad).

... (truncated)

Commits

• 883249a 16.21.1
• e68ff10 Prepare 16.21.1 (#8640)
• 3ad2c44 Fix media-feature-range-notation autofix for exact values (#8651)
• 58b162d Document config, plugin and formatter packages on npm (#8650)
• a0b4a8d Fix function-linear-gradient-no-nonstandard-direction false positives for C...
• 3a47448 Bump the jest group across 1 directory with 3 updates (#8634)
• 1a19d6a Bump rollup from 4.44.0 to 4.44.1 (#8644)
• f6958a8 Bump prettier from 3.5.3 to 3.6.2 (#8645)
• 395ae69 Bump eslint from 9.29.0 to 9.30.0 in the eslint group (#8646)
• ce56d5d Fix unexpected change of syntax in computed EditInfo (#8638)
• Additional commits viewable in compare view

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Superseded by #1774.