Changes from 3.7.0 to 3.8.0

Improvements

Support for Python 3.11 has been added (PR #962).
Support for Python 3.6 and Python 3.7 has been dropped (PR #966).
Added a new (registered) HDF5 filter for Blosc2 compressor (PR #969).
Added optimized paths for Blosc2 reading and writing in tables. This
bypasses the HDF5 filter pipeline by building the Blosc2 CFrames and
sending them to the HDF5 direct chunking machinery (PR #969).
Internal C-Blosc sources updated to 1.21.2.
Thanks to Oscar Guiñon, Francesc Alted for implementing Blosc2 the
support and NumFOCUS for providing a grant for that.

Starting form this release, C source files generated by Cython are no
longer included in the source distribution package.
Pre-built HTML documentation is no longer included in the source package.