Drop our private plymouth-update-initrd copy, it is identical to upstream
    New upstream git snapshot, with the following fixes:
    Tweaks to the spinner/bgrt themes to match the gdm/gnome-shell lock screen
      password entry style tweaks done in GNOME 3.34
    Move the keyboard layout and capslock indicator closer to the text field
    Fix flickering below spinner on hidpi displays:
      https://gitlab.freedesktop.org/plymouth/plymouth/issues/83
    Add logrotate file for /var/log/boot.log so that it does not grow endlessly:
      https://gitlab.freedesktop.org/plymouth/plymouth/issues/31
    Some bgrt fixes for devices with non-upright mounted LCD panels