feat: get_service_packages, which packages a node's systemd unit is (NetOrk/netork#1236)

Mixes in napalm-device-types' ServicePackagesMixin; the transport is the
node's exec path, as for the kernel facts. Read-only. Requires
napalm-device-types 4.20.0; version 0.6.0.

pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "napalm-proxmox"
-version = "0.5.0"
+version = "0.6.0"
 description = "NAPALM driver for Proxmox VE (classic Linux networking, SDN, OVS)"
 readme = "README.md"
 license = { text = "Apache-2.0" }
@@ -25,7 +25,7 @@ classifiers = [
 requires-python = ">=3.9"
 dependencies = [
     "napalm>=5.0.0",
-    "napalm_device_types>=4.19.0",
+    "napalm_device_types>=4.20.0",
     "paramiko>=5.0.0",  # CVE-2026-44405; imported directly for SSH fallback (driver.py)
     "proxmoxer>=2.0.0",
     "netaddr>=0.9.0",