fix: packages/job-server/package.json to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JS-NEXT-10176058

Author: snyk-bot

packages/job-server/package.json

@@ -47,7 +47,7 @@
     "ioredis": "^5.2.4",
     "luxon": "^3.1.0",
     "mysql2": "^2.3.3",
-    "next": "^v12.3.2",
+    "next": "^14.2.24",
     "octokit": "^2.0.10",
     "pino": "^8.7.0",
     "react": "^17.0.2",