get_json returns unexpected 404

[arni1981]

I have this in my config/importmap file

pin "flatpickr/dist/l10n/is.js", to: "flatpickr--dist--l10n--is.js.js" # @4.6.13  

Now running ./bin/importmap update results in an error, namely

/importmap/npm.rb:95:in `get_json': Unexpected error response 404: {"code":"ResourceNotFound","message":"/flatpickr/dist/l10n/is.js does not exist"} (Importmap::Npm::HTTPError)

This still works fine however ./bin/importmap pin flatpickr/dist/l10n/is.js --from unpkg

This was working fine on Importmap 2.1.0.
I'm running Ruby 3.3.7

If no one can quickly find what is causing this then I'm willing to take a stab at this some day.

[rafaelfranca]

This is very likely #259.

We don't track the source, so the default hat is jspm don't have that package.