Instead of using PodSecurityPolicy, you can enforce similar restrictions on Pods using either or both:
For a migration guide, see Migrate from PodSecurityPolicy to the Built-In PodSecurity Admission Controller. For more information on the removal of this API, see PodSecurityPolicy Deprecation: Past, Present, and Future.
If you are not running Kubernetes v1.35, check the documentation for your version of Kubernetes.