**Describe the bug**

In c-blosc2 2.13.0 the `register_tuner_private` symbol has been renamed into `blosc2_register_tuner`.
From the name I understand that it is supposed to be a function part of the private API, never the less it is exported via `BLOSC_EXPORT` so it is part of the API.

I think that the `SOVERSION` in `blosc/CMakeLists.txt` should be bumped to 3 for c-blosc2 2.13.x

https://github.com/Blosc/c-blosc2/blob/ebfb27d36f09f9f39f8ba463565b81aa476ccfe2/blosc/CMakeLists.txt#L30-L33 

**To Reproduce**
N/A

**Expected behavior**
`SOVERSION` updated when the API changes

**Logs**
N/A

**System information:**
 - OS: Linux/Unix
 - Version blosc2 2.13.x

**Additional context**
N/A

SOVERSION bump
This is a GitHub Issue
repo:c-blosc2
owner:Blosc
Title : SOVERSION bump
Issue date:

--- start body ---
**Describe the bug**

In c-blosc2 2.13.0 the `register_tuner_private` symbol has been renamed into `blosc2_register_tuner`.
From the name I understand that it is supposed to be a function part of the private API, never the less it is exported via `BLOSC_EXPORT` so it is part of the API.

I think that the `SOVERSION` in `blosc/CMakeLists.txt` should be bumped to 3 for c-blosc2 2.13.x

https://github.com/Blosc/c-blosc2/blob/ebfb27d36f09f9f39f8ba463565b81aa476ccfe2/blosc/CMakeLists.txt#L30-L33 

**To Reproduce**
N/A

**Expected behavior**
`SOVERSION` updated when the API changes

**Logs**
N/A

**System information:**
 - OS: Linux/Unix
 - Version blosc2 2.13.x

**Additional context**
N/A

--- end body ---
