chore(deps): update dependency go to v1.25.9 (#707)

Co-authored-by: renovate-rancher[bot] <119870437+renovate-rancher[bot]@users.noreply.github.com>

Author: renovate-rancher[bot]

go.mod

@@ -2,7 +2,7 @@ module github.com/rancher/steve
 
 go 1.25.0
 
-toolchain go1.25.4
+toolchain go1.25.9
 
 replace (
 	github.com/crewjam/saml => github.com/rancher/saml v0.4.14