Switch to using v3 API of Copr after it was deprecated and removed.
Removal: https://docs.pagure.org/copr.copr/release-notes/2022-09-21.html Migration notes: https://fedora-copr.github.io/posts/api3-migraition-helper
Resolves TFT-1627
Signed-off-by: Matej Focko mfocko@redhat.com