ci: update to new IMAGE_TAG with newer Fedora release

(cherry picked from commit a1aa3a5
 but there were other IMAGE_TAG bumps in the meantime)

Author: alesmrazek

.gitlab-ci.yml

@@ -20,7 +20,7 @@ variables:
   # IMAGE_TAG is a Git branch/tag name from https://gitlab.nic.cz/knot/knot-resolver-ci
   # In general, keep it pointing to a tag - use a branch only for development.
   # More info in the knot-resolver-ci repository.
-  IMAGE_TAG: 'v20240506'
+  IMAGE_TAG: 'v20250324'
   IMAGE_PREFIX: '$CI_REGISTRY/knot/knot-resolver-ci'
 
 image: $IMAGE_PREFIX/debian12-knot_3_3:$IMAGE_TAG