[release-5.36] Update the CI image, to match Skopeo's updated test code

This matches containers/skopeo#2661 ,
without it, any Skopeo test is going to fail, as in
https://github.com/containers/image/pull/2905/checks?check_run_id=46601934935

Signed-off-by: Miloslav Trmač <[email protected]>
Signed-off-by: tomsweeneyredhat <[email protected]>

Author: mtrmac

.cirrus.yml

@@ -30,7 +30,7 @@ env:
     SKOPEO_PR:
 
     # Google-cloud VM Images
-    IMAGE_SUFFIX: "c20250422t130822z-f42f41d13"
+    IMAGE_SUFFIX: "c20250721t181111z-f42f41d13"
     FEDORA_CACHE_IMAGE_NAME: "fedora-${IMAGE_SUFFIX}"
 
     # Container FQIN's (include bleeding-edge development-level container deps.)