fix: Update fast-jwt to 6.2.4 to fix CVE-2026-44351

[jjghali]

fixes CVE-2026-44351 found int fast-jwt 6.2.3 and prior

Testing

Ran unit tests:

pass ./types/index.tst.ts

Targets:    1 passed, 1 total
Test files: 1 passed, 1 total
Assertions: 25 passed, 25 total
Duration:   0.9s

Checklist

• run npm run test && npm run benchmark --if-present
• tests and/or benchmarks are included
• documentation is changed or added
• commit message and code follows the Developer's Certification of Origin
  and the Code of conduct