fix(deps): update nextjs monorepo to v15.5.9

Author: renovate[bot]

package.json

@@ -21,7 +21,7 @@
     "class-variance-authority": "^0.7.1",
     "clsx": "^2.1.1",
     "lucide-react": "^0.484.0",
-    "next": "15.2.4",
+    "next": "15.5.9",
     "react": "19.0.0",
     "react-dom": "19.0.0",
     "tailwind-merge": "^3.0.2",
@@ -49,7 +49,7 @@
     "@vitest/coverage-v8": "^3.0.9",
     "@vitest/ui": "^3.0.9",
     "eslint": "9",
-    "eslint-config-next": "15.2.4",
+    "eslint-config-next": "15.5.9",
     "eslint-config-prettier": "10.1.5",
     "eslint-plugin-import": "2.31.0",
     "eslint-plugin-storybook": "^0.12.0",