Blosc

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* Internal C-Blosc sources updated to 1.21.2 (they are a git submodule now).

* Many small code improvements, improved consistency and typo fixes.
Thanks to Dimitri Papadopoulos Orfanos.

* Support for Python 3.11. Support for Python 3.7 has been dropped.
Thanks to Dimitri Papadopoulos Orfanos.

* Several other fixes, mainly related with the building process, which
should be more solid now in different situations.

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* Add a missed cmake folder to distributed files. See 253.
Thanks to Ben Greiner.

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- Reenable the possibility to use an already installed C-Blosc library.
See 244. Thanks to Ben Greiner.
- Add aarch64 wheels. See 250. Thanks to odidev.
- Deactivate SSE2 and AVX2 if a CPU has no flags. See 242.
Thanks to Graham Inggs.
- Wheels for Linux 32 bits are not distributed anymore.
- Updated vendored C-Blosc to 1.21.1.

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* Update `blosc.nthreads` when `blosc.set_nthreads()` is called.
Fixes 246

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- Updated README.rst with wheels information. See:
https://pypi.org/project/blosc/

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- Added pyproject.toml to fix issues when building the package for a
Python version that does not have a wheel. See:
https://github.com/Blosc/python-blosc/issues/239

- Added blosc/c-blosc/README.md in the source distribution. See:
https://github.com/Blosc/python-blosc/pull/240

- Vendored cpuinfo.py updated to version 7.0.0.