Remove usages of deprecated `self_signed_cert` option
Contributes to https://gitlab.com/gitlab-org/gitlab-shell/-/issues/541
self_signed_cert
option was removed in
gitlab-shell!602 (merged).
Contributes to https://gitlab.com/gitlab-org/gitlab-shell/-/issues/541
self_signed_cert
option was removed in
gitlab-shell!602 (merged).