Bonsai does not compile on CUDA 12+ (texture references no longer supported)

[VictorForouhar]

Current texture management is based on texture references, which are deprecated (texture objects are recommended instead). Support for texture references was dropped in CUDA 12, which meant I was unable to compile Bonsai using the latest version.

Downgrading to CUDA 11 allowed me to compile it.

[jbedorf]

Fixed in #52