pkgcache 2.2.3

• The metadata cache now does not use source URLs for packages in Archive
  on Posit Package Manager repositories. This URLs may serve a different
  package, even a source package when the main URL for the same package
  serves a binary package. The alternative URLs are not needed on PPM,
  anyway, because PPM is in a consistent state w.r.t. metadata and
  package files (r-lib/pak#623).

• parse_packages() now does not throw a warning for empty PACKAGES*
  files (#107).

• repo_set() and the ppm_*() functions, e.g. ppm_snapshots(), now
  work again after the PPM API changes (#110, #115).