Log Message:
blosc2: updated to 2.15.0

Changes from 2.14.4 to 2.15.0
=============================

* Removed some duplicated functions. See \ 
https://github.com/Blosc/c-blosc2/issues/503.

* Added a new io mode to memory map files. This forced to change the `io_cb` \ 
read API.
  See https://github.com/Blosc/c-blosc2/blob/main/tests/test_mmap.c to see an \ 
example on
  how to use it.

* Updated the `SOVERSION` to 4 due to the API change in `io_cb` read.

* Added functions to get cparams, dparams, storage and io defaults respectively.

* Internal zstd sources updated to 1.5.6.

* Fixed a bug when setting a slice using prefilters.