julia

a14cc385 - Artifacts: Change Dict{AbstractPlatform} to Dict{Platform} to reduce Pkg invalidations (#54073)

Artifacts: Change Dict{AbstractPlatform} to Dict{Platform} to reduce Pkg invalidations (#54073) This pull request now only changes `dl_dict = Dict{AbstractPlatform,Dict{String,Any}}()` to `dl_dict = Dict{Platform,Dict{String,Any}}()` in `artifact_meta`. This is possible since the other possible types for the key are either `Platform` or `nothing` unless someone overrides `Artifacts.unpack_platform`.