security/rubygem-gitlab-secret_detection: update to 0.45.0
Required for gitlab 19.4.
Changes: https://gitlab.com/gitlab-org/security-products/secret-detection/secret-detection-service/-/blob/main/CHANGELOG.md
(cherry picked from commit 3a4d6d56a1aa0fe0ea684b43f267cf6fae85f98b)