v0.7.9

What's Changed

• [ci] Roll pinned stable toolchain by @google-pr-creation-bot in #471
• [roll] Install rust-src component when rolling by @joshlf in #469
• [CI] Bump github/codeql-action from 2.21.9 to 2.22.0 by @dependabot in #474
• [CI] Bump ossf/scorecard-action from 2.2.0 to 2.3.0 by @dependabot in #478
• [CI] Bump github/codeql-action from 2.22.0 to 2.22.1 by @dependabot in #479
• Document zerocopy's design ethos by @jswrenn in #405
• document zerocopy's relationship to Project Safe Transmute by @jswrenn in #484
• [POLICIES.md] Initial commit by @joshlf in #485
• Release 0.7.9 by @joshlf in #486

Full Changelog: v0.7.8...v0.7.9