Parallelize dep lock status checks during deps.loadpaths #15099
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To make this safe, git.ex's lock_status no longer uses File.cd! (which mutates global process state), instead passing the `:cd` into System.cmd.
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To make this safe, git.ex's lock_status no longer uses File.cd! (which mutates global process state), instead passing the
:cdinto System.cmd.This is a meaningful performance improvement on our app with ~25 ref deps and hundreds of deps in total, cutting about 400ms off of every mix task.