Upgrade to 2.387.x

[strangelookingnerd]

Since 2.361.x and 2.375.x support was dropped it makes sense to upgrade towards 2.387.x
Had to jump directly to 2.387.3 as jenkins.version since a transitive dependency to font-awesome-api (among others) requires it.

Testing done

Validated changes via mvn clean verify

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[basil]

Thanks for the PR!