feat(download-backend)!: make reqwest/rustls
the new default
#3798
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Part of #3790.
This PR has also fixed the weird business logic where
RUSTUP_USE_CURL=0
actually instructs Rustup to use the curl backend, which might surprise many people including myself and @fh-igd-mueller-roemer from #3791 (comment).A more ideal solution OTOH would be borrowing from my previous work on clap-rs/clap#2664 (Aha, dots connected!), however I'm not sure about its interactions with our current
process().var_os()
. Maybe only the parsing part should be copied over.