Update quay.io/tigera/operator Docker tag to v1.26.0

This MR contains the following updates:

Package	Type	Update	Change
quay.io/tigera/operator	ironbank-docker	minor	v1.25.3 -> v1.26.0
quay.io/tigera/operator		minor	v1.25.3 -> v1.26.0
quay.io/tigera/operator	stage	minor	v1.25.3 -> v1.26.0

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