Update logstash owner in manifest

(cherry picked from commit fa96beb)

Author: mrodm

packages/logstash/manifest.yml

@@ -18,7 +18,7 @@ conditions:
   elastic:
     subscription: basic
 owner:
-  github: elastic/stack-monitoring
+  github: elastic/logstash
   type: elastic
 screenshots:
   - src: /img/kibana-logstash-log.png
@@ -131,4 +131,3 @@ policy_templates:
             multi: false
             required: false
             show_user: false
-