cirrus: bump go version as per go.mod

This is needed to unblock the contianer-libs testing PRs as they all
bump the go.mod minimum version so CI fails without actually testing
anything.

Signed-off-by: Paul Holzinger <[email protected]>

Author: Luap99

.cirrus.yml

@@ -127,7 +127,7 @@ vendor_task:
 
     # Runs within Cirrus's "community cluster"
     container:
-        image: docker.io/library/golang:1.24.3
+        image: docker.io/library/golang:1.24.6
         cpu: 1
         memory: 1