chore(deps): update dependency go to v1.25.9

Author: renovate-rancher[bot]

go.mod

@@ -2,7 +2,7 @@ module github.com/rancher/steve
 
 go 1.23.0
 
-toolchain go1.23.6
+toolchain go1.25.9
 
 replace (
 	github.com/crewjam/saml => github.com/rancher/saml v0.4.14