style: ruff format and the lint rules of the driver standard

Mechanical: ruff format, and ruff check --fix with the rule set every NAPALM
driver uses (E, F, I, UP, B at line length 100, Python 3.10). What ruff
cannot fix comes in the next commit.

tests/test_connection.py

@@ -2,12 +2,13 @@
 
 from __future__ import annotations
 
-import pytest
-from unittest.mock import MagicMock, patch
+from unittest.mock import patch
 
+import pytest
 from napalm.base.exceptions import ConnectionException
+
 from napalm_proxmox.driver import ProxmoxDriver
-from tests.conftest import _build_mock_api, NODES_LIST
+from tests.conftest import _build_mock_api
 
 
 class TestOpen:
@@ -101,9 +102,7 @@ def _open_with(hostname, **api_kwargs):
 
 class TestClusterNodeResolution:
     def test_local_node_wins_over_first_listed(self):
-        drv = _open_with(
-            "172.22.8.120", nodes=CLUSTER_NODES_LIST, cluster_status=CLUSTER_STATUS
-        )
+        drv = _open_with("172.22.8.120", nodes=CLUSTER_NODES_LIST, cluster_status=CLUSTER_STATUS)
         assert drv._node_name == "pve-dual"
 
     def test_matches_by_ip_without_local_flag(self):
@@ -118,9 +117,7 @@ class TestClusterNodeResolution:
 
     def test_matches_short_name_of_fqdn(self):
         status = [{**n, "local": 0} for n in CLUSTER_STATUS if n["type"] == "node"]
-        drv = _open_with(
-            "pve-01.mgmt.example.com", nodes=CLUSTER_NODES_LIST, cluster_status=status
-        )
+        drv = _open_with("pve-01.mgmt.example.com", nodes=CLUSTER_NODES_LIST, cluster_status=status)
         assert drv._node_name == "pve-01"
 
     def test_single_node_without_cluster_status(self):