Merge branch 'appsec-csp-codeowners' into 'master'

Add appsec as code owners of the CSP

See merge request gitlab-org/gitlab!61634

.gitlab/CODEOWNERS

@@ -330,3 +330,6 @@ Dangerfile @gl-quality/eng-prod
 
 [Workhorse]
 /workhorse/ @jacobvosmaer-gitlab @nick.thomas @nolith @patrickbajao
+
+[Application Security]
+/lib/gitlab/content_security_policy/ @gitlab-com/gl-security/appsec