Update Gatekeeper to 3.6.0

New IB Image available.

Make sure to pull in upstream chart updates with kpt (if applicable)

Definition of Done:

• Image versions updated in chart/values.yaml
• Chart version bumped (match upstream chart, reset to bb.0 if the upstream version changes)
• Changelog entry added, note the update to image, any additional updates
• Clean install tested and validated working (see things to test)
• Upgrade tested and validated working (install newest tagged release, upgrade to your branch, then run through things to test)
• Pipeline passing on package MR
• Package MR merged and new release tagged
• BB MR opened, pipeline passing
• BB MR merged (no checkbox, BB MR should auto-close this)

Things to test:

• Validate all pods come up and healthy
• Validate constraints are created and log violations
• ???

/cc @toladipupo @michaelmcleroy feel free to update issue to better reflect process/testing.