Merge branch 'ebassi/flatpak-no-vulkan' into 'main'

ci: Really disable Vulkan for Flatpak bundles

See merge request GNOME/gtk!6769

.gitlab-ci/flatpak-build.sh

@@ -19,6 +19,7 @@ flatpak build ${builddir} meson \
                 --buildtype=debugoptimized \
                 -Dx11-backend=true \
                 -Dwayland-backend=true \
+                -Dvulkan=disabled \
                 -Dbuild-tests=false \
                 -Dbuild-testsuite=false \
                 -Dbuild-examples=false \