Update dependency go to v1.25.8

Author: renovate-rancher[bot]

go.mod

@@ -2,7 +2,7 @@ module github.com/rancher/backup-restore-operator
 
 go 1.24.0
 
-toolchain go1.24.13
+toolchain go1.25.8
 
 replace (
 	golang.org/x/crypto => golang.org/x/crypto v0.35.0

tests/go.mod

@@ -2,7 +2,7 @@ module github.com/rancher/backup-restore-operator/tests
 
 go 1.24.0
 
-toolchain go1.24.13
+toolchain go1.25.8
 
 require (
 	github.com/prometheus-operator/prometheus-operator/pkg/apis/monitoring v0.80.1