Update gatekeeper to 3.6.0

update "chart" (https://github.com/open-policy-agent/gatekeeper) from "v3.5.2" (5733cf33442d2c9485f59c181117c09e588da6cb) to "v3.6.0" (9503ef2307225c5f6e8d97e312efb008a26e36bb)

https://repo1.dso.mil/platform-one/big-bang/bigbang/-/issues/747

chart/Chart.yaml

 apiVersion: v2
-appVersion: v3.5.2
+appVersion: v3.6.0
 description: A Helm chart for Gatekeeper
 name: gatekeeper
 keywords:
   - open policy agent
-version: 3.5.2-bb.1
+version: 3.6.0-bb.0
 home: https://github.com/open-policy-agent/gatekeeper
 sources:
   - https://github.com/open-policy-agent/gatekeeper.git