[MPOM-466] Bump org.apache.rat:apache-rat-plugin from 0.15 to 0.16.1

[dependabot[bot]]

Bumps org.apache.rat:apache-rat-plugin from 0.15 to 0.16.1.

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[ottlinger]

Release information: https://creadur.apache.org/rat/RELEASE_NOTES.txt

Configuration updates for maven users can be found here: https://creadur.apache.org/rat/apache-rat-plugin/examples/custom-license.html

[garydgregory]

Let's get this in please 👍