Fixed typo in jdk8 variable

[judovana]

A typo sneaked in #786. I do not understand how that was possible, as the build faisl also locally. I'm afraid it was some unlucky "after all" typed "backspace" in IDE, where I thought I'm in browser. My apologise!

[github-actions]

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[judovana]

TYVM, https://ci.adoptium.net/view/Dependencies/job/dependency_pipeline/904/ is green.