fix: move jsonwebtoken to dev dependencies (#677)
fix: move jsonwebtoken to dev dependencies (#677)

jsonwebtoken was only used in tests and not present in the release output.

```
[0] firebase-functions$ ag jsonwebtoken
spec/fixtures/mockrequest.ts
1:import * as jwt from 'jsonwebtoken';

package.json
50:    2ace62c1befa19e3ea37dd52be9f6d508c5163e6@types/jsonwebtoken": "^8.3.2",
64:    "jsonwebtoken": "^8.5.1",
[0] firebase-functions$ grep jsonwebtoken -R lib
[1] firebase-functions$
```

Co-authored-by: Lauren Long <d98b6474ddad01f299f24974e1b46fb90a2cf441@users.noreply.github.com>
firebase/firebase-functions,firebase/firebase-functions,firebase/firebase-functions