nixos/zigbee2mqtt: Update syscall filter

The tests would fail after migrating to `buildNpmPackage`, likely
because we are now using nodejs 18.

> audit: type=1326 audit(1670092271.655:102): auid=4294967295 uid=317 gid=317 ses=4294967295 subj=kernel pid=995 comm="node" exe="/nix/store/dj805sw07vvpbxx39c8g67x8qddg0ikw-nodejs-18.12.1/bin/node" sig=31 arch=c000003e syscall=330 compat=0 ip=0x7ff8b655f37b code=0x8000000

nixos/modules/services/home-automation/zigbee2mqtt.nix

@@ -119,9 +119,8 @@ in
         ];
         SystemCallArchitectures = "native";
         SystemCallFilter = [
-          "@system-service"
-          "~@privileged"
-          "~@resources"
+          "@system-service @pkey"
+          "~@privileged @resources"
         ];
         UMask = "0077";
       };