Fix java 8 and update loom, mappings, and loader#3

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FluorideHistorian wants to merge 3 commits intocalmilamsy:masterfrom

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Commits on Dec 18, 2021

fix java 8 issues and bump versions
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Commits on Jan 13, 2022

Update gradle-wrapper.properties
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Commits on Jan 31, 2022

update mappings again (auto updating when)
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