update_packages() fails if some packages can't be updated

[t-kalinowski]

> remotes::update_packages()
Error: HTTP error 404.
  Not Found

  Did you spell the repo owner (`dfalbel`) and repo name (`walmartdata`) correctly?
  - If spelling is correct, check that you have the required permissions to access the repo.

On this R installation, update.packages() ignored {walmartdata} and then went on to update 6 other packages.

[gaborcsardi]

It is unlikely that we'll improve this, but the pak package will hopefully have update functionality soon.