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

@@ -8,15 +8,13 @@ version = "0.7.0"
 description = "NAPALM driver for OpenWrt routers/access-points"
 readme = "README.md"
 license = "Apache-2.0"
-requires-python = ">=3.10"
+requires-python = ">=3.12"
 authors = [
     { name = "Christian Manivong" },
 ]
 classifiers = [
     "Topic :: Utilities",
     "Programming Language :: Python :: 3",
-    "Programming Language :: Python :: 3.10",
-    "Programming Language :: Python :: 3.11",
     "Programming Language :: Python :: 3.12",
     "Operating System :: POSIX :: Linux",
     "Operating System :: MacOS",
@@ -49,7 +47,7 @@ napalm_openwrt = ["py.typed"]
 
 [tool.ruff]
 line-length = 100
-target-version = "py310"
+target-version = "py312"
 
 [tool.ruff.lint]
 select = ["E", "F", "I", "UP", "B"]
@@ -59,7 +57,7 @@ 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