remotes 2.5.0

• install_github() now uses credentials from the git
  credential store, if GITHUB_PAT and GITHUB_TOKEN are not set.
• The Remotes field in DESCRIPTION now accepts explicit package names:
  <pkgname>=<type>::<username>/<repo> (#719, @heavywatal).
• dev_package_deps() now works for packages with Enhances dependencies
  (#711, @maksymiuks).
• install_dev() now ignores a trailing slash (#692, @krlmlr).
• System requirements now support Ubuntu 22.04.
• local_package_deps() now errors for non-existent directories
  (#772, @MatthieuStigler).