`status` can error when the RHS in `[extensions]` does not map to a weak dep

[KristofferC]

(InlineStrings) pkg> test
     Testing InlineStrings
      Status `/private/var/folders/tp/2p4x9ygx48sgsdl1ccg1mp_40000gn/T/jl_XqfzsA/Project.toml`
ERROR: KeyError: key "ParsersExt" not found
Stacktrace:
  [1] getindex
    @ ./dict.jl:498 [inlined]
  [2] status_ext_info(pkg::Pkg.Types.PackageSpec, env::Pkg.Types.EnvCache)
    @ Pkg.Operations ~/.julia/juliaup/julia-1.10.4+0.aarch64.apple.darwin14/share/julia/stdlib/v1.10/Pkg/src/Operations.jl:2214

[KristofferC]

I had a type where I had

[extensions]
ArrowTypesExt = "ArrowTypes"
ParsersExt = "ParsersExt"

instead of "Parsers".