fix(deps): update module github.com/openmcp-project/openmcp-operator/api to v0.15.2

Author: renovate[bot]

go.mod

@@ -6,7 +6,7 @@ godebug default=go1.23
 
 require (
 	github.com/openmcp-project/controller-utils v0.23.1
-	github.com/openmcp-project/openmcp-operator/api v0.15.1
+	github.com/openmcp-project/openmcp-operator/api v0.15.2
 	github.com/stretchr/testify v1.11.1
 	k8s.io/api v0.34.1
 	k8s.io/apiextensions-apiserver v0.34.1