Error in testset spawn:
Error During Test at C:\buildbot\worker-tabularasa\tester_win32\build\share\julia\test\testdefs.jl:21
  Got exception outside of a @test
  LoadError: Error reading ca cert file C:\buildbot\worker\package_win32\build\usr\share\julia\cert.pem - mbedTLS: (-0x3E00) PK - Read/write of file failed while requesting https://cache.julialang.org/https://frippery.org/files/busybox/busybox.exe
  Stacktrace:
    [1] (::Downloads.var"#9#17"{IOStream, Base.DevNull, Nothing, Vector{Pair{String, String}}, Nothing, Bool, Bool, String, Int32, Bool, Bool})(easy::Downloads.Curl.Easy)
      @ Downloads C:\buildbot\worker\package_win32\build\usr\share\julia\stdlib\v1.6\Downloads\src\Downloads.jl:333
    [2] with_handle(f::Downloads.var"#9#17"{IOStream, Base.DevNull, Nothing, Vector{Pair{String, String}}, Nothing, Bool, Bool, String, Int32, Bool, Bool}, handle::Downloads.Curl.Easy)
      @ Downloads.Curl C:\buildbot\worker\package_win32\build\usr\share\julia\stdlib\v1.6\Downloads\src\Curl\Curl.jl:51
    [3] #8
      @ C:\buildbot\worker\package_win32\build\usr\share\julia\stdlib\v1.6\Downloads\src\Downloads.jl:284 [inlined]
    [4] arg_write(f::Downloads.var"#8#16"{Base.DevNull, Nothing, Vector{Pair{String, String}}, Nothing, Bool, Bool, String, Int32, Bool, Bool}, arg::IOStream)
      @ ArgTools C:\buildbot\worker\package_win32\build\usr\share\julia\stdlib\v1.6\ArgTools\src\ArgTools.jl:112
    [5] #7
      @ C:\buildbot\worker\package_win32\build\usr\share\julia\stdlib\v1.6\Downloads\src\Downloads.jl:283 [inlined]
    [6] arg_read
      @ C:\buildbot\worker\package_win32\build\usr\share\julia\stdlib\v1.6\ArgTools\src\ArgTools.jl:61 [inlined]
    [7] request(url::String; input::Nothing, output::IOStream, method::Nothing, headers::Vector{Pair{String, String}}, progress::Nothing, verbose::Bool, throw::Bool, downloader::Nothing)
      @ Downloads C:\buildbot\worker\package_win32\build\usr\share\julia\stdlib\v1.6\Downloads\src\Downloads.jl:282
    [8] #3
      @ C:\buildbot\worker\package_win32\build\usr\share\julia\stdlib\v1.6\Downloads\src\Downloads.jl:199 [inlined]
    [9] open(f::Downloads.var"#3#4"{Nothing, Vector{Pair{String, String}}, Nothing, Bool, Nothing, String}, args::String; kwargs::Base.Iterators.Pairs{Symbol, Bool, Tuple{Symbol}, NamedTuple{(:write,), Tuple{Bool}}})
      @ Base .\io.jl:330
   [10] arg_write(f::Function, arg::String)
      @ ArgTools C:\buildbot\worker\package_win32\build\usr\share\julia\stdlib\v1.6\ArgTools\src\ArgTools.jl:86
   [11] #download#2
      @ C:\buildbot\worker\package_win32\build\usr\share\julia\stdlib\v1.6\Downloads\src\Downloads.jl:198 [inlined]
   [12] download(url::String, output::String)
      @ Downloads C:\buildbot\worker\package_win32\build\usr\share\julia\stdlib\v1.6\Downloads\src\Downloads.jl:198
   [13] top-level scope
      @ C:\buildbot\worker-tabularasa\tester_win32\build\share\julia\test\spawn.jl:24
...