Michael Sproul c7e978b727 Update blst to 0.3.11 (#4624) ...

## Proposed Changes

This PR updates `blst` to 0.3.11, which gives us _runtime detection of CPU features_ 🎉

Although [performance benchmarks](https://gist.github.com/michaelsproul/f759fa28dfa4003962507db34b439d6c) don't show a substantial detriment to running the `portable` build vs `modern`, in order to take things slowly I propose the following roll-out strategy:

- Keep both `modern` and `portable` builds for releases/Docker images.
- Run the `portable` build on half of SigP's infrastructure to monitor for performance deficits.
- Listen out for user issues with the `portable` builds (e.g. SIGILLs from misdetected hardware).
- Make the `portable` build the default and remove the `modern` build from our release binaries & Docker images.

2023-08-17 02:37:32 +00:00

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