[librsvg] (13 commits) ...Merge branch 'update-clap' into 'main'

[Marge Bot <marge-bot src gnome org>]

Summary of changes:

  21f18de... Remove unnecessary derive (*)
  5c28d96... WIP: Update clap to 3.2.22 (*)
  8ac4a21... Make the 'output' option take a PathBuf value parser (*)
  fc00cc7... Parse the format option by hand again (*)
  b450fce... Fix parsing of --background=none (*)
  27d5ed1... Parse the background-color option by hand (*)
  4db939c... See if the keep_aspect option is present using the old meth (*)
  3325479... The arguments for input files must be OsString (*)
  f2772c7... Fix the output option (*)
  dbd5efb... Fix the stylesheet argument (*)
  200f116... Don't use ValueEnum - we aren't really using it now (*)
  25d1a09... Remove superfluous reference (*)
  d15bfb9... Merge branch 'update-clap' into 'main'

(*) This commit already existed in another branch; no separate mail sent