Fix groupId in exclusion of GSON

[jtnord]

amends #456 to fix the exclusion as noted by @basil

Testing done

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[basil]

https://issues.jenkins.io/browse/JENKINS-72857?

[jtnord]

https://issues.jenkins.io/browse/JENKINS-72857?

That would have been #456 (as the dependency is closer to the api plugin the exclusion is more for clarity and to prevent accidental promotion in the future should it be changed in the libraries we are pulling in).