chore(deps): update nextjs monorepo to v15.2.1 (#477)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

package.json

@@ -24,7 +24,7 @@
     "@types/react-dom": "^19",
     "clsx": "^2.1.1",
     "eslint": "^9.21.0",
-    "eslint-config-next": "15.2.0",
+    "eslint-config-next": "15.2.1",
     "fuse.js": "^7.1.0",
     "gray-matter": "^4.0.3",
     "highlight.js": "^11.11.1",
@@ -32,7 +32,7 @@
     "lint-staged": "^15.4.3",
     "marked": "^15.0.7",
     "marked-highlight": "^2.2.1",
-    "next": "15.2.0",
+    "next": "15.2.1",
     "postcss-nested": "^7.0.2",
     "postcss-preset-env": "^10.1.5",
     "prettier": "^3.5.3",