Fix issues when artifacts are being downloaded concurrently#755

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LexManos merged 3 commits intoMinecraftForge:FG_4.0from

shartte:fix-697

May 9, 2021

Commits on Mar 11, 2021

Fixes #697: Concurrent attempts at downloading artifacts will be synchronized to avoid corrupted files on disk
shartte
committed
Downgrade logging to info.
shartte
committed

Commits on Mar 27, 2021

Comment on why all parameters are used as the key for the concurrency-guard.
shartte
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