Update ruby-net-ldap to 0.18.0 (Closes: #1041020)
For CI tests, see https://salsa.debian.org/ruby-team/redmine/-/pipelines/551995 or branch bts1041020-test as this needs ruby-net-ldap from experimental.
For CI tests, see https://salsa.debian.org/ruby-team/redmine/-/pipelines/551995 or branch bts1041020-test as this needs ruby-net-ldap from experimental.