New downloading issues in 1.6-rc1

[mbauman]

Multiple users are reporting issues downloading registries with the new Downloads.jl curl approach, for example:

(DosingApp) pkg> up
    Updating registry at `~/.julia/registries/General`
^C┌ Error: curl_multi_remove_handle: 1================>   ]  92.3 %
└ @ Downloads.Curl ~/julia/usr/share/julia/stdlib/v1.6/Downloads/src/Curl/utils.jl:36

This is well-tracked upstream at JuliaLang/Downloads.jl#95 and JuliaLang/Downloads.jl#99, but I'm submitting this here to suggest it be a 1.6-blocker.

[fredrikekre]

Worked around in JuliaLang/Downloads.jl#96 which is included in #39615 and backported in #39614.

[KristofferC]

Worked around in JuliaLang/Downloads.jl#96

I don't think so, see: JuliaLang/Downloads.jl#99 (comment)

tested on the latest backports-1.6, so it includes JuliaLang/Downloads.jl#96.

[fredrikekre]

Ah okay, JuliaLang/Downloads.jl#95 is worked around though.