[gnome-tour/barthalion/gnome-runtime-images-quay] Update (or drop) the Docker image used by Flatpak job

[Bartłomiej Piotrowski <bpiotrowski src gnome org>]

commit 506417c50eb18829ed9f2d0bfd15497055bd9063
Author: Bartłomiej Piotrowski <b bpiotrowski pl>
Date:   Wed Jul 27 12:47:40 2022 +0200

    Update (or drop) the Docker image used by Flatpak job
    
    The gnome-runtime-images have been recently migrated to Quay. This is already reflected in the template.
    
    Please note this MR has been created semi-automatically. If it doesn't make sense, feel free to close it.

 .gitlab-ci.yml | 1 -
 1 file changed, 1 deletion(-)
---
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index ab90986..0409023 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -3,7 +3,6 @@ include:
     file: "flatpak/flatpak-ci-initiative-sdk-extensions.yml"
 
 flatpak:
-  image: "registry.gitlab.gnome.org/gnome/gnome-runtime-images/rust_bundle:master"
   variables:
     BUNDLE: "org.gnome.TourDevel.flatpak"
     MANIFEST_PATH: "build-aux/org.gnome.TourDevel.json"