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_vm_provision_mixin.py

@@ -3,12 +3,11 @@
 from __future__ import annotations
 
 import base64
+from unittest.mock import MagicMock, patch
 
 import pytest
-from unittest.mock import MagicMock, patch
-from napalm_proxmox.driver import ProxmoxDriver
-from napalm_proxmox.vm_provision_mixin import ProxmoxVMProvisionMixin
 
+from napalm_proxmox.vm_provision_mixin import ProxmoxVMProvisionMixin
 
 # ---------------------------------------------------------------------------
 # Tests