build(deps): bump lib/zsdoc from a6850e3 to ea0d809

Bumps [lib/zsdoc](https://github.com/z-shell/zsdoc) from `a6850e3` to `ea0d809`.
- [Release notes](https://github.com/z-shell/zsdoc/releases)
- [Commits](z-shell/zsdoc@a6850e3...ea0d809)

---
updated-dependencies:
- dependency-name: lib/zsdoc
  dependency-type: direct:production
...

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

Author: dependabot[bot]