Bump @devvit/public-api from 0.12.1 to 0.12.4

Bumps @devvit/public-api from 0.12.1 to 0.12.4.

---
updated-dependencies:
- dependency-name: "@devvit/public-api"
  dependency-version: 0.12.4
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]