KAFKA-12400: Upgrade jetty to fix CVE-2020-27223
KAFKA-12400: Upgrade jetty to fix CVE-2020-27223

Here is the fix. The reason of [CVE-2020-27223](https://nvd.nist.gov/vuln/detail/CVE-2020-27223) was DOS vulnerability for Quoted Quality CSV headers and [patched in 9.4.37.v20210219](https://github.com/eclipse/jetty.project/security/advisories/GHSA-m394-8rww-3jr7).

This PR updates Jetty dependency into the following version, 9.4.38.v20210224.

Author: Lee Dongjin <dongjin@apache.org>

Reviewers: Manikumar Reddy <manikumar.reddy@gmail.com>

Closes #10245 from dongjinleekr/feature/KAFKA-12400

TiVo/kafka,Chasego/kafka,Chasego/kafka,Chasego/kafka,guozhangwang/kafka,TiVo/kafka,apache/kafka,lindong28/kafka,apache/kafka,TiVo/kafka,lindong28/kafka,Chasego/kafka,apache/kafka,guozhangwang/kafka,apache/kafka,lindong28/kafka,guozhangwang/kafka,TiVo/kafka,lindong28/kafka,guozhangwang/kafka