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_environment.py

@@ -2,11 +2,12 @@
 
 from __future__ import annotations
 
-import pytest
-from tests.conftest import _build_mock_api, NODE_STATUS
 from unittest.mock import patch
 
+import pytest
+
 from napalm_proxmox.driver import ProxmoxDriver
+from tests.conftest import _build_mock_api
 
 
 class TestGetEnvironment:
@@ -25,9 +26,6 @@ class TestGetEnvironment:
         assert isinstance(result["fans"], dict)
 
     def test_temperature_with_sensors(self):
-        from tests.conftest import _build_mock_api, NODE_STATUS
-        from unittest.mock import patch
-        from napalm_proxmox.driver import ProxmoxDriver
 
         sensors_data = [
             {"name": "CPU Package", "value": "55.0"},
@@ -49,9 +47,6 @@ class TestGetEnvironment:
         assert result["temperature"]["GPU Core"]["is_critical"] is False
 
     def test_temperature_critical(self):
-        from tests.conftest import _build_mock_api
-        from unittest.mock import patch
-        from napalm_proxmox.driver import ProxmoxDriver
 
         sensors_data = [{"name": "NVMe", "value": "98.0"}]
         mock_api = _build_mock_api(sensors=sensors_data)