[ci] Run on the ubuntu-20.04-64core runner #1309
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Use `cargo nextest` to run Miri tests on twice the number of threads as there are CPU cores.
This should enable better parallelization, especially under Miri in CI. Comparing [1] (run with the parent commit) and [2] (run with this commit), we see an overall speedup of 22m51s -> 18m28s, or ~19%. [1] https://github.com/google/zerocopy/actions/runs/9148942749 [2] https://github.com/google/zerocopy/actions/runs/9148952446
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Now that we've parallelized the execution of our Miri tests (in #1307 and #1308), our tets should benefit more from underlying parallelism.