ci: Add libjpeg-turbo-devel to the Fedora image

This was getting downloaded from sourceforge every
time for the docs build, and that started failing.

.gitlab-ci.yml

@@ -25,7 +25,7 @@ variables:
   BACKEND_FLAGS: "-Dx11-backend=true -Dwayland-backend=true -Dbroadway-backend=true"
   FEATURE_FLAGS: "-Dvulkan=enabled -Dcloudproviders=enabled"
   MESON_TEST_TIMEOUT_MULTIPLIER: 3
-  FEDORA_IMAGE: "registry.gitlab.gnome.org/gnome/gtk/fedora:v32"
+  FEDORA_IMAGE: "registry.gitlab.gnome.org/gnome/gtk/fedora:v33"
   FLATPAK_IMAGE: "registry.gitlab.gnome.org/gnome/gnome-runtime-images/gnome:master"
 
 .only-default:

.gitlab-ci/fedora.Dockerfile

@@ -48,7 +48,9 @@ RUN dnf -y install \
     libcloudproviders-devel \
     libepoxy-devel \
     libffi-devel \
+    libjpeg-turbo-devel \
     libmount-devel \
+    libpng-devel \
     librsvg2 \
     libselinux-devel \
     libubsan \