chore(deps): update module sigs.k8s.io/structured-merge-diff/v4 to v6

Signed-off-by: red-hat-konflux <126015336+red-hat-konflux[bot]@users.noreply.github.com>

Author: red-hat-konflux[bot]

go.mod

@@ -1,8 +1,8 @@
 module github.com/redhat-developer/gitops-operator
 
-go 1.22.0
+go 1.23
 
-toolchain go1.22.5
+toolchain go1.23.9
 
 require (
 	github.com/argoproj-labs/argo-rollouts-manager v0.0.6-0.20250617204159-f21adc07bd2c