fix buildkite settings to include 8.x branch (#2557)

Author: moukoublen

catalog-info.yaml

@@ -26,7 +26,7 @@ spec:
         build_tags: false
         build_pull_requests: false
         filter_enabled: true
-        filter_condition: build.branch == "main" || build.branch =~ /^[0-9]+\.[0-9]+$$/
+        filter_condition: build.branch == "main" || build.branch =~ /^[0-9]+\.[0-9x]+$$/
       teams:
         cloud-security-posture:
           access_level: MANAGE_BUILD_AND_READ