devel/py-msgspec0.21.1

devel/py-msgspec: Update to 0.21.1

Changes:	https://github.com/jcrist/msgspec/releases
		https://jcristharif.com/msgspec/changelog.html

devel/py-msgspec: Update to 0.20.0

Changes:	https://github.com/jcrist/msgspec/releases
		https://jcristharif.com/msgspec/changelog.html

*: Revise USES=python:... version range constraints

and strip all lower bounds of 3.9 or 3.10 because they are implied now.

python:3.9-X  -> python:-X
python:3.9+   -> python
python:3.10-X -> python:-X
python:3.10+  -> python
(options such as ,build preserved)

devel/py-msgspec: Update to 0.19.0

Changes:	https://github.com/jcrist/msgspec/releases
		https://jcristharif.com/msgspec/changelog.html

devel/py-msgspec: Clean up

Mk/Uses/python.mk: Introduce PY_TOMLI

- Convert ports to use PY_TOMLI to simplify Makefile.

The minimal version is set to 2.0.1 because it is required by multiple ports such as devel/py-poetry.
The upper bound of version is set to 3 because it is limited by devel/py-poetry.

With hat:	python

devel/py-pyyaml: Move devel/py-yaml to devel/py-pyyaml

- Bump PORTREVISION of dependent ports for dependency change

devel/py-msgspec: Add py-msgspec 0.18.6

msgspec is a fast serialization and validation library, with builtin support for
JSON, MessagePack, YAML, and TOML. It features:
- High performance encoders/decoders for common protocols. The JSON and
 MessagePack implementations regularly benchmark as the fastest options for
  Python.
- Support for a wide variety of Python types. Additional types may be supported
  through extensions.
- Zero-cost schema validation using familiar Python type annotations. In
  benchmarks msgspec decodes and validates JSON faster than orjson can decode it
  alone.
- A speedy Struct type for representing structured data. If you already use
  dataclasses or attrs, structs should feel familiar. However, they're 5-60x
  faster for common operations.

All of this is included in a lightweight library with no required dependencies.