Install HDF5 for mac CI

[alessandrofelder]

Description

What is this PR

• [x] Bug fix
• [ ] Addition of a new feature
• [ ] Other

Why is this PR needed?

Installation of brainrender fails on MacOS.

What does this PR do?

Adds a step to the Mac CI that brew installs HDF5.

References

temporary fix for #259

How has this PR been tested?

Looking at CI output.

Is this a breaking change?

Nope

Does this PR require an update to the documentation?

Yes - we will document any new things that users need to do to install on Mac (If we can't avoid this).

Checklist:

• [n/a] The code has been tested locally
• [n/a] Tests have been added to cover all new functionality (unit & integration)
• [n/a] The documentation has been updated to reflect any changes
• [x] The code has been formatted with pre-commit

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (f638888) 67.86% compared to head (218c0ce) 67.86%. Report is 1 commits behind head on mega-fix.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## mega-fix #265 +/- ## ========================================= Coverage 67.86% 67.86% ========================================= Files 26 26 Lines 1195 1195 ========================================= Hits 811 811 Misses 384 384 ```

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