Upgrade licensee gem to 9.16.0+

During Ruby 3.1/3.2 audit (refer to this table and search for the gem name), we discovered that
it's worth upgrading to 9.16.0 because starting from this version, both 3.1 and 3.2 pipelines are run: https://github.com/licensee/licensee/releases

Alternatively, we may want to retest the current version manually with the given Ruby versions.

Team/Group/Domain: Gitaly