Update Zeek to 4.0.5

[JonZeolla]

Summary of the contribution

Update Zeek to 4.0.5 and librdkafka to 1.4.4. Updating librdkafka to the latest release failed; separating that effort for another time.

Breaking change

This removes support for Centos 8, which was already non-functional.

Testing

Leverage built-in tests.

Checklist

• Confirm that any associated issues are indicated in the pull request title
• Rebase your PR against the latest commit within the target branch
• Include steps to verify and test the intended change
• Write or update unit tests and/or integration tests to verify your changes
• Run shellcheck against any new or updated shell scripts, indicating the reasoning behind any disabled checks
• Indicate whether or not this is a breaking change
• Ensure that any new dependencies are these dependencies licensed in a way that is compatible for inclusion under ASF 2.0