fix(deps): update kubernetes packages to v0.31.1

| datasource | package             | from    | to      |
| ---------- | ------------------- | ------- | ------- |
| go         | k8s.io/api          | v0.30.3 | v0.31.1 |
| go         | k8s.io/apimachinery | v0.30.3 | v0.31.1 |


Signed-off-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

go.mod

@@ -7,8 +7,8 @@ require (
 	github.com/cloudnative-pg/machinery v0.0.0-20240919131343-9dd62b9257c7
 	github.com/onsi/ginkgo/v2 v2.20.2
 	github.com/onsi/gomega v1.34.2
-	k8s.io/api v0.30.3
-	k8s.io/apimachinery v0.30.3
+	k8s.io/api v0.31.1
+	k8s.io/apimachinery v0.31.1
 	sigs.k8s.io/controller-runtime v0.18.4
 )