[libhandy/wip/exalm/ci] ci: Use f34 instead of latest

[Alexander Mikhaylenko <alexm src gnome org>]

commit e3d9bfd0b9c5740fdb1d7877e5765131f4f48874
Author: Maximiliano Sandoval R <msandova gnome org>
Date:   Wed Feb 2 21:54:00 2022 +0100

    ci: Use f34 instead of latest
    
    f35 seems to fail as follows:
    
    ../examples/handy-demo.gresources.xml: Failed to close file descriptor for child process (Operation not 
permitted).

 .gitlab-ci.yml | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index e53748ba..861bd45b 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -18,7 +18,7 @@ api-visibility:
     - ./.gitlab-ci/api-visibility.sh
 
 doc:
-  image: fedora:latest
+  image: fedora:34
   stage: build
   variables:
     MESON_ARGS: >-
@@ -57,7 +57,7 @@ build-flatpak-glade:
     BUNDLE: 'sm.puri.Handy.Glade.flatpak'
 
 abi-check:
-  image: fedora:latest
+  image: fedora:34
   stage: build
   variables:
     LAST_ABI_BREAK: "b90b5120c5e9e3f5a3b0d228bd7ddb24f053289a"