Update jenkins/jenkins Docker tag to v2.426.3

This MR contains the following updates:

Package	Type	Update	Change
jenkins/jenkins		patch	2.426.2-lts -> 2.426.3-lts
jenkins/jenkins	ironbank-docker	patch	2.426.2-lts -> 2.426.3-lts
jenkins/jenkins	stage	patch	2.426.2-lts -> 2.426.3-lts

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Release Notes

jenkinsci/docker (jenkins/jenkins)

v2.426.3

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