build(deps-dev): Bump @csstools/postcss-oklab-function

Bumps [@csstools/postcss-oklab-function](https://github.com/csstools/postcss-plugins/tree/HEAD/plugins/postcss-oklab-function) from 2.2.3 to 3.0.0.
- [Changelog](https://github.com/csstools/postcss-plugins/blob/main/plugins/postcss-oklab-function/CHANGELOG.md)
- [Commits](https://github.com/csstools/postcss-plugins/commits/HEAD/plugins/postcss-oklab-function)

---
updated-dependencies:
- dependency-name: "@csstools/postcss-oklab-function"
  dependency-type: direct:development
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

package.json

@@ -7,7 +7,7 @@
     "devDependencies": {
         "@babel/core": "^7.22.5",
         "@babel/preset-env": "^7.22.5",
-        "@csstools/postcss-oklab-function": "^2.2.3",
+        "@csstools/postcss-oklab-function": "^3.0.0",
         "autoprefixer": "^10.4.14",
         "babel-loader": "^9.1.2",
         "browserlist": "^1.0.1",