chore: the template's floor on napalm is 5.1 (#6)

napalm 5.0 and older import pkg_resources, which a Python 3.12 venv no
longer has; every driver's lowest job failed on it.

template/pyproject.toml

@@ -16,7 +16,7 @@ classifiers = [
     "Topic :: System :: Networking",
 ]
 dependencies = [
-    "napalm>=5.0",
+    "napalm>=5.1",  # older releases import pkg_resources, which a 3.12 venv lacks
     "napalm-device-types>=4.21",
 ]