Bump postcss-mixins from 9.0.4 to 11.0.3

Bumps [postcss-mixins](https://github.com/postcss/postcss-mixins) from 9.0.4 to 11.0.3.
- [Release notes](https://github.com/postcss/postcss-mixins/releases)
- [Changelog](https://github.com/postcss/postcss-mixins/blob/main/CHANGELOG.md)
- [Commits](postcss/postcss-mixins@9.0.4...11.0.3)

---
updated-dependencies:
- dependency-name: postcss-mixins
  dependency-type: direct:development
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

pnpm-lock.yaml

@@ -106,7 +106,7 @@
     "postcss-discard-comments": "^6.0.1",
     "postcss-import": "^16.1.0 ",
     "postcss-loader": "^4.2.0",
-    "postcss-mixins": "^9.0.4",
+    "postcss-mixins": "^11.0.3",
     "postcss-modules": "^4.2.2",
     "postcss-nesting": "^12.0.2",
     "postcss-pxtorem": "^6.0.0",