feat: switch off the fix templates QTS cannot take (0.4.0)

napalm-linux 0.8 implements napalm-device-types' fix templates. QTS has
no apt, dnf or opkg and sets its SNMP agent in its own UI, so
configure_snmp_agent, configure_package_proxy and ensure_package are
None here: a capability check answers no instead of offering a fix
that fails, as the inherited fix_snmp and fix_apt_proxy did.

get_device_warnings returns nothing: the inherited one asked for
updates, which is None here, and logged a TypeError on every poll.

The role test follows napalm-linux's get_os_users.

Closes #6. Part of #7.

pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "napalm-qnap-qts"
-version = "0.3.0"
+version = "0.4.0"
 description = "NAPALM driver for QNAP NAS systems running QTS via SSH"
 readme = "README.md"
 requires-python = ">=3.9"
@@ -44,7 +44,7 @@ classifiers = [
 dependencies = [
     "napalm>=4.0",
     "napalm-device-types>=2.6.0",
-    "napalm-linux>=0.3.0",
+    "napalm-linux>=0.8.0",
     "netmiko>=4.0.0",
     "paramiko>=5.0.0",  # CVE-2026-44405
 ]