[jammy] Purple background is visible briefly during the login animation

Fix proposed:
https://salsa.debian.org/gnome-team/gnome-shell/-/merge_requests/59

This bug was fixed in the package gnome-shell - 42.0-2ubuntu1

---------------
gnome-shell (42.0-2ubuntu1) jammy; urgency=medium

  [ Marco Trevisan (Treviño) ]
  * debian/patches: Cherry-pick upstream fixes targetting 42.1
  * debian/patches: Compute system ackground color from theme (LP: #1965727)
  * ubuntu/configure-login-screen.patch: Use bg color for initial system bg
    (LP: #1965727)
  * debian/patches: Ensure St.Entry's `selected-color` CSS property is honored
    (LP: #1878998)
  * ubuntu/support-loading-Yaru-variants: Handle dark/light variants better
  * d/p/main-Avoid-meta-finalize: Leak gjs context only on ubiquity sessions
    (LP: #1964458)
  * d/p/use-favorites-strings: Only apply this to ubuntu session
  * debian/patches: Do not hang and crash if fingerprint service fails to start
    (LP: #1962566)
  * debian: Use gnomebluetooth-3.0 as dependency and revert patches disabling it
    (LP: #1738838, #1968364, #1964600)

  [ Jeremy Bicha ]
  * Use libgweather4 instead of old libgweather (LP: #1964600)
  * Add patch to work around meson issue (Debian 1008189)
  * releasing package gnome-shell version 42.0-2
  * debian/control.in: Recommend power-profiles-daemon for power mode feature

  [ Daniel van Vugt ]
  * main-Avoid-meta-finalize.patch: Leak GJS to work around LP: #1964458

  [ Gunnar Hjalmarsson ]
  * Revert "dash: Use pin instead of favorites"

  [ Jeremy Bicha ]
  * Remaining changes with debian:
    - Replace gnome-backgrounds dep with ubuntu-wallpapers and Suggests
      gnome-themes-standard-data, gnome-backgrounds
    - Add some Recommends:
      + ubuntu-session (| gnome-session) to have the ubuntu session available
      + xserver-xorg-legacy
      + yaru-theme-gnome-shell for the default ubuntu theming
      + gnome-remote-desktop to provide remote desktop support by default
    - Moved some Recommends to Suggests:
      + chrome-gnome-shell
    - Update debian/gbp.conf with Ubuntu settings
    - gnome-shell-common.prerm: Remove deprecated ubuntu theme alternative
    - ubuntu/desktop_detect.patch:
      + add caching for desktop detection to avoid querying the current
        desktop env variable as iterate through the list each time. For the
        time of the Shell process, we can expect this env variable to stay
        stable.
    - ubuntu/smarter_alt_tab.patch:
      + quick alt-tab (without showing up the switcher) switch only between
        the last window of the last 2 applications to be focused instead of
        raising all windows of those apps.
    - ubuntu/lightdm-user-switching.patch:
      + Allow user switching when using LightDM.
    - ubuntu/lock_on_suspend.patch
      + Respect Ubuntu's lock-on-suspend setting.
    - ubuntu/background_login.patch
      + Change default background color as we modified the default GDM color
        for our ubuntu session.
    - ubuntu/gdm_alternatives.patch
      + Add support for GDM3 theme alternatives
    - optional-hot-corner.patch
      + enable patch proposed by upstream developer already in package (but
        not in series) to add a settings for optional hot corner activation.
    - main-show-an-error-message-on-gnome-shell-crash.patch,
      global-m...