piwheel builds fail, causing uninstallability on raspberry pi's.

**Describe the bug**
blosc2 doesn't provide wheels for armhf.
A reliable workaround for this is to rely on piwheels, which provides pre-built wheels for most popular packages.

This worked fine for blosc2==2 - but fails for blosc2==3, as they fail to build these wheels

**To Reproduce**

Look at the logs on [piwheels](https://www.piwheels.org/project/blosc2/)
Analyze the comment from @bennuttall about what the issue with the piwheels build is [here](https://github.com/piwheels/packages/issues/492#issuecomment-2557875595) - which essentially seems to be that blosc2 is downloaded from github.

**Expected behavior**
Either provide wheels for raspberry on pypi 3.9 and 3.11 should do - or help fix the issue with piwheels building.

**Desktop (please complete the following information):**
- OS: [e.g. iOS] raspbian
- Version [e.g. 22]