fix: package.json to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JS-NEXT-15104645
- https://snyk.io/vuln/SNYK-JS-NEXT-15105315
- https://snyk.io/vuln/SNYK-JS-ESLINT-15102420

Author: snyk-bot

package.json

@@ -299,7 +299,7 @@
     "mdast-util-to-markdown": "2.1.0",
     "mdast-util-to-string": "^4.0.0",
     "morgan": "^1.10.0",
-    "next": "^15.1.5",
+    "next": "^16.1.5",
     "ora": "^8.0.1",
     "parse5": "7.1.2",
     "quick-lru": "7.0.0",
@@ -368,7 +368,7 @@
     "cross-env": "^7.0.3",
     "csp-parse": "0.0.2",
     "csv-parse": "5.5.6",
-    "eslint": "^8.57.1",
+    "eslint": "^9.26.0",
     "eslint-config-prettier": "^10.0.1",
     "eslint-import-resolver-typescript": "^3.6.3",
     "eslint-plugin-github": "^5.0.2",