This update for bluebird-theme xfce4-notifyd xfdashboard xfce4-whiskermenu-plugin xfdesktop fixes the following issues:

- xfce4-notifyd was updated to 0.9.7:

  * meson-build: Use SPDX license expression
  * meson-build: Update debug/optimization flag management
  * build: Add meson build files to autotools generated tarball
  * Do a full windowing system support check on startup
  * Fix string leaks in notification_plugin_menu_new
  * Fix button padding for top-position notifications with the XP-Balloon theme
  * Fix class names and rule application.
  * Add XP-Balloon theme to build system
  * Add XP-Balloon theme
  * Add positioning style classes to XfceNotifyWindow
  * Add more compiler flags to the meson build
  * Terminate cleanly on SIGQUIT
  * Shut up warning about maybe uninitialized variable
  * Fix two memory leaks
  * Translation Updates

- xfce4-whiskermenu-plugin was updated to 2.9.2:
  * Fix menu not shown on correct monitor. (Issue #154)

- xfdesktop was updated to 4.20.1:
  * Improve performance of gradient rendering
  * meson-build: Use SPDX license expression
  * Don't send URIs to the clipboard when the paster requests UTF8_STRING
  * Ensure single-workspace-number is never set to a negative value
  * Show loop device volumes if "Other Devices" is selected
  * For the "unknown volumes" type, don't require it to be removable
  * Initialize icon label font point size settings to defaults
  * Fix use-after-free when attempting to load invalid background
  * settings: keep a reference to the backdrop preview model
  * Work around GTK issue with setting the file chooser button folder
  * Manually call gtk_init() in main()
  * Don't add the XfceSMClient command-line options if no X11 support
  * meson-build: Update debug/optimization flag management
  * Fix monitor chooser UI resource path
  * Translation Updates