Upgrade EasyMock version to be compatible with Jdk 17+

[trnguyencflt]

The version of easymock in 7.3.x branch is 5.2.0 while all 7.3.x-post branches are 4.3.

EasyMock version 4.3 isn't compatible with Jdk 17 (used in Semaphore) so upgrading it. As far as compatibility issue concern, as EasyMock 5.2.0 is used in branch 7.3.x already, it should not be a problem.

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[cla-assistant]

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[janjwerner-confluent]

lgtm, started a rebuild as the pr merge test failed downloading kafka artifacts. let's see the outcome of the downstream validation.

[trnguyencflt]

lgtm, started a rebuild as the pr merge test failed downloading kafka artifacts. let's see the outcome of the downstream validation.

@janjwerner-confluent thanks, the build on Jenkins still fail with this error for which I don't really know how to fix 😢

13:03:25  [ERROR] Failed to execute goal io.confluent:resolver-maven-plugin:0.5.0:resolve-kafka-range (default-cli) on project common-parent: MojoExecutionException: Could not find any ce-kafka artifacts. -> [Help 1]

Is that still ok to merge?