Update openpolicyagent/gatekeeper Docker tag to v3.17.0

This MR contains the following updates:

Package	Type	Update	Change
openpolicyagent/gatekeeper		minor	v3.16.3 -> v3.17.0
openpolicyagent/gatekeeper	ironbank-docker	minor	v3.16.3 -> v3.17.0
openpolicyagent/gatekeeper	stage	minor	v3.16.3 -> v3.17.0

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