chore: release v13.9.0 (#3642)

Co-authored-by: svetlanabrennan <gh-actions-svetlanabrennan@github.com>
Co-authored-by: Svetlana Brennan <50715937+svetlanabrennan@users.noreply.github.com>
Co-authored-by: Bob Evans <revans@newrelic.com>

Author: 4 people