removed posix-api dependency from pom

[dawitgirm]

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What does this PR do?

Issue: The jnr-posix-api dependency was added to the jenkins BOM, so this PR removes the redundant dependency linkage in the pom.xml.

Description of the Change

The dependency in the pom.xml was removed.

Alternate Designs

Possible Drawbacks

Verification Process

Passed all local tests and tested manually with a local Jenkins instance using both the agent and HTTP forwarding methods to connect jenkins with Datadog.

Additional Notes

Release Notes

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