build(deps-dev): bump postcss-preset-mantine in /ui/mantine-ui (#4646)

Bumps [postcss-preset-mantine](https://github.com/mantinedev/postcss-preset-mantine) from 1.17.0 to 1.18.0.
- [Commits](https://github.com/mantinedev/postcss-preset-mantine/commits)

---
updated-dependencies:
- dependency-name: postcss-preset-mantine
  dependency-version: 1.18.0
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

ui/mantine-ui/package-lock.json

@@ -41,7 +41,7 @@
     "eslint-plugin-react": "^7.37.5",
     "jsdom": "^26.1.0",
     "postcss": "^8.5.5",
-    "postcss-preset-mantine": "1.17.0",
+    "postcss-preset-mantine": "1.18.0",
     "postcss-simple-vars": "^7.0.1",
     "prettier": "^3.5.3",
     "prop-types": "^15.8.1",