Update nginx Docker tag to v1.26.0

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
nginx	kubernetes_replication_controller	minor	1.25.5 -> 1.26.0
nginx	kubernetes_pod	minor	1.25.5 -> 1.26.0
nginx	kubernetes_deployment	minor	1.25.5 -> 1.26.0

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