ci: Update go version to 1.25.9

Signed-off-by: Adam Wolfe Gordon <awg@upbound.io>

Author: adamwg

.github/workflows/ci.yml

@@ -10,7 +10,7 @@ on:
 
 env:
   # Common versions
-  GO_VERSION: '1.25.6'
+  GO_VERSION: '1.25.9'
   GOLANGCI_VERSION: 'v2.11.4'
 
 jobs: