Adding firewall to /proc/{id}/... network namespace is not working

### Description

Adding firewall rules to network namespace based on /proc/{proc id}/ns/net, works correctly runc

The same does not work with runsc .

### Steps to reproduce

_No response_

### runsc version

_No response_

### docker version (if using docker)

_No response_

### uname

_No response_

### kubectl (if using Kubernetes)

_No response_

### repo state (if built from source)

_No response_

### runsc debug logs (if available)

_No response_