meta: bump postcss-mixins from 9.0.4 to 10.0.0

Bumps [postcss-mixins](https://github.com/postcss/postcss-mixins) from 9.0.4 to 10.0.0.
- [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...10.0.0)

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

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

package.json

@@ -74,7 +74,7 @@
     "postcss": "~8.4.35",
     "postcss-calc": "~9.0.1",
     "postcss-import": "~16.0.0",
-    "postcss-mixins": "~9.0.4",
+    "postcss-mixins": "~10.0.0",
     "postcss-simple-vars": "~7.0.1",
     "react": "^18.2.0",
     "react-dom": "^18.2.0",