devel/rubygem-version_gem: update to 1.1.8
Required for gitlab 18.0
Changes: https://gitlab.com/oauth-xx/version_gem/-/blob/main/CHANGELOG.md
PR: 286873
Approved by: sunpoet (maintainer)
(cherry picked from commit d8949d3253913bc0e2a6aabb62421458943b1e98)