Update CS_MAJOR_VERSION to 3

changelogs/unreleased/263482-container-scanning-version-3.yml

+---
+title: Update container_scanning to version 3 to support FIPS
+merge_request: 47099
+author:
+type: added

lib/gitlab/ci/templates/Security/Container-Scanning.gitlab-ci.yml

@@ -4,8 +4,7 @@ variables:
   # Setting this variable will affect all Security templates
   # (SAST, Dependency Scanning, ...)
   SECURE_ANALYZERS_PREFIX: "registry.gitlab.com/gitlab-org/security-products/analyzers"
-
-  CS_MAJOR_VERSION: 2
+  CS_MAJOR_VERSION: 3
 
 container_scanning:
   stage: test