owners.yaml: Remove Alex Gladkov (legionus)
Alex Gladkov is no longer with Red Hat effective 1 May 2024.
Remove him from the owners.yaml file.
Furthermore, since the kernel namespace subsystem now has fewer than
three combined maintainers and reviewers, flip requiredApproval to
false.
Signed-off-by: Joel Savitz jsavitz@redhat.com
Edited by Joel Savitz