v0.31.0-rc2

[borg323]

In this version:

• Changed cuda compilation options to use -arch=native or -arch=all-major if no specific version is requested, with fallback for older cuda that don't support those options.
• Updated android builds to use openblas 0.3.27.
• A few small fixes.

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This discussion was created from the release v0.31.0-rc2.