secp: context randomize in a few places - #1594

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/cache/restore@v4, actions/checkout@v4. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/

boost@1.85 was installed but not linked because boost is already linked. To link this version, run: brew link boost@1.85

boost@1.85 has been deprecated because it is a versioned formula! It was disabled on 2026-04-05.

`$HOMEBREW_NO_INSTALLED_DEPENDENTS_CHECK` is set: not checking for outdated dependents or dependents with broken linkage!