Bump postcss-load-config from 4.0.1 to 5.0.0 (#2559)

Bumps [postcss-load-config](https://github.com/postcss/postcss-load-config) from 4.0.1 to 5.0.0.
- [Release notes](https://github.com/postcss/postcss-load-config/releases)
- [Changelog](https://github.com/postcss/postcss-load-config/blob/main/CHANGELOG.md)
- [Commits](postcss/postcss-load-config@v4.0.1...v5.0.0)

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

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

package.json

@@ -67,7 +67,7 @@
     "postcss-calc": "^8.2.4",
     "postcss-custom-properties-fallback": "^1.0.2",
     "postcss-import": "^15.0.0",
-    "postcss-load-config": "^4.0.1",
+    "postcss-load-config": "^5.0.0",
     "postcss-scss": "^4.0.5",
     "postcss-simple-vars": "^7.0.1",
     "prettier": "^2.8.8",