upgrade jQuery File Upload to 9.22.1 (CVE-2018-9206)

https://seclists.org/oss-sec/2018/q4/54 http://www.vapidlabs.com/advisory.php?v=204

https://www.zdnet.com/article/zero-day-in-popular-jquery-plugin-actively-exploited-for-at-least-three-years

The vulnerability received the CVE-2018-9206 identifier earlier this month, a good starting point to get more people paying attention. All jQuery File Upload versions before 9.22.1 are vulnerable. Since the vulnerability affected the code for handling file uploads for PHP apps, other server-side implementations should be considered safe.

(is this better placed in services or sysadmin maybe?)