Upgrade Jetty server dependency to 9.4.43.v20210629

[xjin-Confluent]

Problem

Upgrade Jetty Version

Solution

Does this solution apply anywhere else?

• [x ] yes
• no

If yes, where?

common, rest-utils, etc

Test Strategy

Testing done:

• Unit tests
• Integration tests
• System tests
• Manual tests

Release Plan

[ghost]

Hey @xjin-Confluent,
thank you for your Pull Request.

@confluentinc It looks like this brave person signed our Contributor License Agreement. 👍

Always at your service,

clabot

[kkonstantine]

LGTM
I built the hdfs connector at 5.2.x locally and tests passed. That's a good sign to move forward. We'll assess status of builds in latest branches after we merge.