Bump sys/quickjs from 2868a65 to 85640f8

Bumps [sys/quickjs](https://github.com/quickjs-ng/quickjs) from `2868a65` to `85640f8`.
- [Release notes](https://github.com/quickjs-ng/quickjs/releases)
- [Commits](quickjs-ng/quickjs@2868a65...85640f8)

---
updated-dependencies:
- dependency-name: sys/quickjs
  dependency-version: 85640f81e04bc93940acc2756c792c66076dd768
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]