build(deps): bump yard from 0.9.39 to 0.9.42 in /docs

Bumps [yard](https://yardoc.org) from 0.9.39 to 0.9.42.

---
updated-dependencies:
- dependency-name: yard
  dependency-version: 0.9.42
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>