unpin jetty, get the version from common

[janjwerner-confluent]

Description

Unpin jetty dependency version to use the version defined in common to address CVEs

[atlantis-infrasec-infra]

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[cla-assistant]

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[tzulitai]

@janjwerner-confluent unpinning it still lets it resolve to 9.4.51 it seems, as in the parent common pom that's the version declared.

[janjwerner-confluent]

@tzulitai
common has version 9.4.53 set:
https://github.com/confluentinc/common/blob/a056b8be5baab3cee47f4be26b24b8896a706bf3/pom.xml#L61