Update calico/node Docker tag to v3.18.0

This MR contains the following updates:

Package	Type	Update	Change
calico/node	ironbank-docker	minor	v3.17.3 -> v3.18.0
calico/node		minor	v3.17.3 -> v3.18.0
calico/node	stage	minor	v3.17.3 -> v3.18.0

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