Fix voxels on linux firefox

[ffreyer]

Description

With firefox on linux voxels() refuses to render. (Also affects Pluto, at least when opened with firefox) This is caused by the per-instance dummy data of voxels not being used in the shader.

I don't remember what exactly I tested before, but when I originally implemented this just fetching the per-instance data was enough. And it is in vscode and in chrome, but not in firefox.

Type of change

• Bug fix (non-breaking change which fixes an issue)

Checklist

• Added an entry in CHANGELOG.md (for new features and breaking changes)
• Added or changed relevant sections in the documentation
• Added unit tests for new algorithms, conversion methods, etc.
• Added reference image tests for new plotting functions, recipes, visual options, etc.

[MakieBot]

Benchmark Results

SHA: 5d2bf4bd6f0540173cea66ac805760aeddea892e

Warning

These results are subject to substantial noise because GitHub's CI runs on shared machines that are not ideally suited for benchmarking.