Migrate to go-1.25

[majst01]

Description

Tests are failing in a strange way, TypeMeta is not filled anymore:

--- FAIL: TestAddAnnotation (0.00s)
    --- FAIL: TestAddAnnotation/add (0.00s)
        types_annotations_test.go:248: diff (+got -want):
               &v2.Firewall{
              	TypeMeta: v1.TypeMeta{
            - 		Kind:       "",
            + 		Kind:       "Firewall",
            - 		APIVersion: "",
            + 		APIVersion: "firewall.metal-stack.io/v2",
              	},
              	ObjectMeta: {Name: "test", ResourceVersion: "1", Annotations: {"test": "true"}},
              	Spec:       {},
              	... // 2 identical fields
              }