cirrus: remove unused vars

Drop them as they are not used and set to an incorrect value as well.

Signed-off-by: Paul Holzinger <pholzing@redhat.com>

Author: Luap99

.cirrus.yml

@@ -2,12 +2,6 @@
 
 # Main collection of env. vars to set for all tasks and scripts.
 env:
-    ####
-    #### Cache-image names to test with (double-quotes around names are critical)
-    ####
-    FEDORA_NAME: "fedora-40"
-    FEDORA_AARCH64_NAME: "${FEDORA_NAME}-aarch64"
-
     # Image identifiers
     IMAGE_SUFFIX: "c20250618t143630z-f42f41d13"