steam-runtime-tools v0.20230405.0

  [ Ludovico de Nittis ]
  * pressure-vessel: Ignore the Discord IPC socket if it's a dangling
    symlink, fixing a regression in 0.20230403.0 for users of the
    Discord Flatpak app (steam-runtime#581)

  [ Simon McVittie ]
  * Add some missing symbols to the ABI tracking
  * Documentation updates
    - container-runtimes: Add release notes link
    - container-runtimes: Link to for general info
    - slr-for-game-developers: Fix some broken links
  * Correct version number in