Remove Python 3.8/3.9 compatibility code

[Copilot]

Now that requires-python = ">=3.10", several compatibility shims are no longer needed.

Changes

• conftest.py: Drop from __future__ import annotations — PEP 585/604 syntax works natively at runtime in 3.10+
• jaraco/context/__init__.py:
  • Move TypeAlias from TYPE_CHECKING guard to regular typing imports — it was guarded to avoid ImportError on 3.8/3.9 where typing.TypeAlias didn't exist
  • Move ParamSpec from typing_extensions → typing (added to stdlib in 3.10); Self and Unpack remain in typing_extensions as they require 3.11+

# Before
from typing import (
    TYPE_CHECKING,
    Literal,
    TypeVar,
    cast,
)

if TYPE_CHECKING:
    from typing import TypeAlias
    from typing_extensions import ParamSpec, Self, Unpack

# After
from typing import (
    TYPE_CHECKING,
    Literal,
    TypeAlias,   # no longer needs TYPE_CHECKING guard
    TypeVar,
    cast,
)

if TYPE_CHECKING:
    from typing import ParamSpec  # moved from typing_extensions
    from typing_extensions import Self, Unpack  # still need 3.11+

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• http://pypi.org:80/
  • Triggering command: /usr/bin/python python -m pytest --doctest-modules jaraco/context/__init__.py -v (http block)
  • Triggering command: /usr/bin/python python -m pytest -v --uid-owner 0 -j ACCEPT (http block)
  • Triggering command: /usr/bin/python python -m pytest -v --tb=short unset --global p/bin/git user.email (http block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Remove Python 3.8 and 3.9 compatibility code</issue_title>
<issue_description>This project now relies on Python 3.10 and later. Remove any behaviors no longer required for older Pythons.</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Remove Python 3.8 and 3.9 compatibility code #21

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