fix(deps): update dependency postcss-preset-mantine to ^1.18.0 (#3510)

Co-authored-by: homarr-renovate[bot] <158783068+homarr-renovate[bot]@users.noreply.github.com>

apps/nextjs/package.json

@@ -75,7 +75,7 @@
     "jotai": "^2.12.5",
     "mantine-react-table": "2.0.0-beta.9",
     "next": "15.3.4",
-    "postcss-preset-mantine": "^1.17.0",
+    "postcss-preset-mantine": "^1.18.0",
     "prismjs": "^1.30.0",
     "react": "19.1.0",
     "react-dom": "19.1.0",