Update dependency stylelint to v16.21.0 (#4580)

This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [stylelint](https://stylelint.io)
([source](https://redirect.github.com/stylelint/stylelint)) | [`16.20.0`
->
`16.21.0`](https://renovatebot.com/diffs/npm/stylelint/16.20.0/16.21.0)
|
[![age](https://developer.mend.io/api/mc/badges/age/npm/stylelint/16.21.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![adoption](https://developer.mend.io/api/mc/badges/adoption/npm/stylelint/16.21.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![passing](https://developer.mend.io/api/mc/badges/compatibility/npm/stylelint/16.20.0/16.21.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![confidence](https://developer.mend.io/api/mc/badges/confidence/npm/stylelint/16.20.0/16.21.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|

---

### Release Notes

<details>
<summary>stylelint/stylelint (stylelint)</summary>

###
[`v16.21.0`](https://redirect.github.com/stylelint/stylelint/blob/HEAD/CHANGELOG.md#16210---2025-06-19)

[Compare
Source](https://redirect.github.com/stylelint/stylelint/compare/16.20.0...16.21.0)

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
([#&#8203;8595](https://redirect.github.com/stylelint/stylelint/pull/8595))
([@&#8203;ybiquitous](https://redirect.github.com/ybiquitous)).
- Added: `ignore: ["after-custom-property"]` to
`custom-property-empty-line-before`
([#&#8203;8627](https://redirect.github.com/stylelint/stylelint/pull/8627))
([@&#8203;imkesin](https://redirect.github.com/imkesin)).
- Fixed: `cache` configuration property not being respected
([#&#8203;8599](https://redirect.github.com/stylelint/stylelint/pull/8599))
([@&#8203;ybiquitous](https://redirect.github.com/ybiquitous)).
- Fixed: `fastest-levenshtein` import when bundling
([#&#8203;8621](https://redirect.github.com/stylelint/stylelint/pull/8621))
([@&#8203;onigoetz](https://redirect.github.com/onigoetz)).
- Fixed: `named-grid-areas-no-invalid` false positives for interpolated
grid-template-areas in CSS-in-JS
([#&#8203;8606](https://redirect.github.com/stylelint/stylelint/pull/8606))
([@&#8203;shahana308](https://redirect.github.com/shahana308)).
- Fixed: `selector-pseudo-*-no-unknown` false positives for the missing
form control styling selectors
([#&#8203;8623](https://redirect.github.com/stylelint/stylelint/pull/8623))
([@&#8203;tyrann0us](https://redirect.github.com/tyrann0us)).

</details>

---

### Configuration

📅 **Schedule**: Branch creation - At any time (no schedule defined),
Automerge - At any time (no schedule defined).

🚦 **Automerge**: Enabled.

♻ **Rebasing**: Whenever PR is behind base branch, or you tick the
rebase/retry checkbox.

🔕 **Ignore**: Close this PR and you won't be reminded about this update
again.

---

- [ ] <!-- rebase-check -->If you want to rebase/retry this PR, check
this box

---

This PR was generated by [Mend Renovate](https://mend.io/renovate/).
View the [repository job
log](https://developer.mend.io/github/Runroom/archetype-symfony).

<!--renovate-debug:eyJjcmVhdGVkSW5WZXIiOiI0MC42MC4xIiwidXBkYXRlZEluVmVyIjoiNDAuNjAuMSIsInRhcmdldEJyYW5jaCI6Im1haW4iLCJsYWJlbHMiOltdfQ==-->

Author: renovate[bot]

package-lock.json

@@ -61,7 +61,7 @@
         "postcss-simple-vars": "7.0.1",
         "postcss-sort-media-queries": "5.2.0",
         "prettier": "3.4.2",
-        "stylelint": "16.20.0",
+        "stylelint": "16.21.0",
         "stylelint-config-recommended": "15.0.0",
         "stylelint-config-standard": "37.0.0",
         "ts-loader": "9.5.2",