Update nextjs monorepo to v13.4.15

Author: renovate[bot]

package.json

@@ -16,17 +16,17 @@
     "@fec/remark-a11y-emoji": "^3.1.0",
     "@mdx-js/loader": "^2.3.0",
     "@mdx-js/react": "^2.3.0",
-    "@next/bundle-analyzer": "13.4.10",
-    "@next/eslint-plugin-next": "13.4.10",
-    "@next/mdx": "13.4.10",
+    "@next/bundle-analyzer": "13.4.15",
+    "@next/eslint-plugin-next": "13.4.15",
+    "@next/mdx": "13.4.15",
     "@octokit/rest": "^20.0.1",
     "@supabase/supabase-js": "2.21.0",
     "@vercel/analytics": "^1.0.1",
     "bright": "^0.8.2",
     "globby": "^13.2.2",
     "htmlparser2": "^9.0.0",
     "lodash.debounce": "4.0.8",
-    "next": "13.4.10",
+    "next": "13.4.15",
     "next-mdx-remote": "^4.4.1",
     "next-remote-watch": "2.0.0",
     "next-themes": "^0.2.1",
@@ -60,7 +60,7 @@
     "critters": "0.0.19",
     "dotenv": "16.3.1",
     "eslint": "8.45.0",
-    "eslint-config-next": "13.4.10",
+    "eslint-config-next": "13.4.15",
     "eslint-plugin-import": "2.27.5",
     "eslint-plugin-mdx": "^2.1.0",
     "eslint-plugin-react": "7.32.2",