chore(deps): update dependency go to v1.25.4

Author: renovate[bot]

go.mod

@@ -1,6 +1,6 @@
 module github.com/openmcp-project/control-plane-operator
 
-go 1.25.3
+go 1.25.4
 
 require (
 	github.com/crossplane-contrib/xp-testing v1.8.0