CUDA toolkit lookup fixed; flash attention enabled on CC 6.x

What's Changed

• ci: avoid unbounded parallelism by @dhiltgen in https://github.com/ollama/ollama/pull/16966
• fix cuda toolkit lookup and parallel by @MarkWard0110 in https://github.com/ollama/ollama/pull/16613
• docs(cloud): update retirement list by @mxyng in https://github.com/ollama/ollama/pull/17000
• discover: fall back to standard CUDA when the JetPack runner is absent by @kevinpark1217 in https://github.com/ollama/ollama/pull/16949
• agent: harness core by @ParthSareen in https://github.com/ollama/ollama/pull/16963
• llama: clean up dead code from llama-server work by @dhiltgen in https://github.com/ollama/ollama/pull/17007
• rocm: remove no longer supported devices by @dhiltgen in https://github.com/ollama/ollama/pull/17010
• compat: use UTF-8-safe file open by @dhiltgen in https://github.com/ollama/ollama/pull/16999
• llama: enable FA on CUDA CC 6.x GPUs by @dhiltgen in https://github.com/ollama/ollama/pull/16994
• mlx: x/create rewrite by @pdevine in https://github.com/ollama/ollama/pull/16919
• llama.cpp update by @dhiltgen in https://github.com/ollama/ollama/pull/17055
• server: remove OLLAMA_EXPERIMENT=client2 by @mxyng in https://github.com/ollama/ollama/pull/16962
• mlx: update to de7b4ed9 by @dhiltgen in https://github.com/ollama/ollama/pull/17056

New Contributors

• @kevinpark1217 made their first contribution in https://github.com/ollama/ollama/pull/16949

Full Changelog: https://github.com/ollama/ollama/compare/v0.31.1...v0.31.2-rc0