dev-ruby/*: add missing 'versionator' inherit

dev-ruby/*: add missing 'versionator' inherit

Noticed failure when ran

 $ PORTAGE_ELOG_CLASSES="qa" egencache --repo=gentoo --update --update-use-local-desc --jobs=$(nproc)
 * ERROR: dev-ruby/rspec-expectations-3.7.0::gentoo failed (depend phase):
 *   External commands disallowed while sourcing ebuild: get_version_component_range 1-2
 *
 * Call stack:
 *                         ebuild.sh, line 624:  Called source '/gentoo-ebuilds/gentoo/dev-ruby/rspec-expectations/rspec-expectations-3.7.0.ebuild'
 *   rspec-expectations-3.7.0.ebuild, line  25:  Called command_not_found_handle 'get_version_component_range' '1-2'
 *                         ebuild.sh, line  89:  Called die
 * The specific snippet of code:
 *              die "External commands disallowed while sourcing ebuild: ${*}"

Signed-off-by: Sergei Trofimovich <slyfox@gentoo.org>