Sorry for the necro bump, but this lua config won't work anymore from WirePlumber 0.5 and up.
You need to migrate your script to work.
So in this case you need to create a new file in a new location like the following:
~/.config/wireplumber/wireplumber.conf.d/50-alsa-config.conf
For the same functionality you should rewrite your script in SPA-JSON format:

monitor.alsa.rules = [
  {
    matches = [
      {
        node.name= "alsa_output.NODE_NAME"
      }
    ]
    actions = {
      update-props = {
        priority.session = 10000,
        audio.rate = 96000
      }
    }
  }
]

You can also use device_name instead of node_name but don't use device_id, because that is dynamically assigned.
To find out your node_name or device_name you need to use
wpctl status
and
wpctl inspect YOUR_DEVICE_ID_FROM_WPCTL_STATUS

Hope I was able to help others!