Correct the metadata for the Security Partners doc page

doc/integration/security_partners/index.md

 ---
-stage: Protect
-group: Container Security
+stage: Secure
+group: Static Analysis
 info: To determine the technical writer assigned to the Stage/Group associated with this page, see https://about.gitlab.com/handbook/engineering/ux/technical-writing/#designated-technical-writers
 type: index
 ---