chore: Python 3.12 is the floor (NAPALM/driver-standard#6)

netOrk runs every driver in its own containers on Python 3.12, so 3.10
and 3.11 are no longer supported or tested. requires-python, mypy and
ruff move to 3.12, along with what ruff's pyupgrade rules then rewrite.

pyproject.toml

@@ -15,12 +15,10 @@ classifiers = [
     "Intended Audience :: Developers",
     "Intended Audience :: System Administrators",
     "Programming Language :: Python :: 3",
-    "Programming Language :: Python :: 3.10",
-    "Programming Language :: Python :: 3.11",
     "Programming Language :: Python :: 3.12",
     "Topic :: System :: Networking",
 ]
-requires-python = ">=3.10"
+requires-python = ">=3.12"
 dependencies = [
     "napalm>=5.0.0",
     "napalm_device_types>=4.22.0",
@@ -50,7 +48,7 @@ napalm_proxmox = ["py.typed"]
 
 [tool.ruff]
 line-length = 100
-target-version = "py310"
+target-version = "py312"
 
 [tool.ruff.lint]
 select = ["E", "F", "I", "UP", "B"]
@@ -60,7 +58,7 @@ select = ["E", "F", "I", "UP", "B"]
 "tests/**" = ["E501"]
 
 [tool.mypy]
-python_version = "3.10"
+python_version = "3.12"
 strict = true
 # napalm itself is untyped, so every driver subclasses Any.
 disallow_subclassing_any = false