Require Jenkins 2.426.3 or newer

[MarkEWaite]

Require Jenkins 2.426.3 or newer

Users that are upgrading the plugin are already running 2.426.3 or newer. Jenkins 2.426.3 includes a critical security fix that should be used by all Jenkins users. It is a good choice for minimum Jenkins version.

https://stats.jenkins.io/pluginversions/msbuild.html shows that:

• 92% of 1.31 installations are already running Jenkins 2.426.3 or newer
• 95% of 1.32 installations are already running Jenkins 2.426.3 or newer
• 97% of 1.33 installations are already running Jenkins 2.426.3 or newer

Testing done

Confirmed that mvn clean verify passes on my Linux computer. Rely on ci.jenkins.io to check the Windows configurations. No surprises expected.

Submitter checklist

• Make sure you are opening from a topic/feature/bugfix branch (right side) and not your main branch!
• Ensure that the pull request title represents the desired changelog entry
• Please describe what you did
• Link to relevant issues in GitHub or Jira
• Link to relevant pull requests, esp. upstream and downstream changes
• Ensure you have provided tests - that demonstrates feature works or fixes the issue