Fix broken icon on modern Jenkins versions

[NotMyFault]

Fixes JENKINS-67771

Probably best to merge it after #373, because this change either requires 2.319.x or newer.

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[NotMyFault]

Heyo @car-roll,

now that you have have merged #373, do you mind taking a look at this PR too? The requirements are now met.
Thanks in advance :)

[NotMyFault]

Could you try to trigger the release workflow again please? GitHub actions had an issue with drafts yesterday.
See https://groups.google.com/g/jenkinsci-dev/c/110lPg1O2u0 for reference.

[car-roll]

hmm, looks like there are still some issues
https://github.com/jenkinsci/script-security-plugin/runs/5340998166?check_suite_focus=true

[NotMyFault]

hmm, looks like there are still some issues https://github.com/jenkinsci/script-security-plugin/runs/5340998166?check_suite_focus=true

Did you delete possible duplicates from the releases tab? https://github.com/jenkinsci/script-security-plugin/releases

The deployment to artifactory was successful https://repo.jenkins-ci.org/releases/org/jenkins-ci/plugins/script-security/1140.vf967fb_efa_55a_/

[car-roll]

yeah, looks okay now. I bunch of dependabot actions went through.