chore(deps): update jenkins/jenkins docker tag to v2.418

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
jenkins/jenkins	final	minor	2.417-alpine -> 2.418-alpine

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Release Notes

jenkinsci/docker (jenkins/jenkins)

### [`v2.418`](https://togithub.com/jenkinsci/docker/compare/2.417...2.418) [Compare Source](https://togithub.com/jenkinsci/docker/compare/2.417...2.418)

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[codeclimate[bot]]

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