Quantus-miner Release v4.0.2

What's Changed

• Speedup for Apple Metal GPUs
• ci: pin the stable rust toolchain by @n13 in https://github.com/Quantus-Network/quantus-miner/pull/91
• Different kernels for Apple Metal vs Nvidia and everything else by @n13 in https://github.com/Quantus-Network/quantus-miner/pull/92
• Release v4.0.2 by @n13 in https://github.com/Quantus-Network/quantus-miner/pull/93

Full Changelog: https://github.com/Quantus-Network/quantus-miner/compare/v4.0.1...v4.0.2