Fix JaCoCo workflow: handle fork/Dependabot PRs and eliminate set-output deprecation#1499

Copilot wants to merge 4 commits intodependabot/npm_and_yarn/arangodb-foxx-services/webpack-5.105.0AbsaOSS/spline:dependabot/npm_and_yarn/arangodb-foxx-services/webpack-5.105.0from

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