Add platform security team to hardening_manifest (#190827)

## Summary

Adds platform security team to `hardening_manifest`

src/dev/build/tasks/os_packages/docker_generator/templates/ironbank/hardening_manifest.yaml

@@ -60,7 +60,23 @@ maintainers:
     name: 'Alexander Klepal'
     username: 'alexander.klepal'
     cht_member: true
-  - email: "yalabe.dukuly@anchore.com"
-    name: "Yalabe Dukuly"
-    username: "yalabe.dukuly"
-    cht_member: true
+  - cht_member: false
+    email: larry.gregory@elastic.co
+    name: Larry Gregory
+    username: legrego
+  - cht_member: false
+    email: aleh.zasypkin@elastic.co
+    name: Aleh Zasypkin
+    username: azasypkin
+  - cht_member: false
+    email: kurt.greiner@elastic.co
+    name: Kurt Greiner
+    username: kc13greiner
+  - cht_member: false
+    email: jeramy.soucy@elastic.co
+    name: Jeramy Soucy
+    username: jeramysoucy
+  - cht_member: false
+    email: sid.mantri@elastic.co
+    name: Sid Mantri
+    username: sidmantri