ci(dependabot): bump zod-to-json-schema from 3.21.0 to 3.21.4

Bumps [zod-to-json-schema](https://github.com/StefanTerdell/zod-to-json-schema) from 3.21.0 to 3.21.4.
- [Release notes](https://github.com/StefanTerdell/zod-to-json-schema/releases)
- [Changelog](https://github.com/StefanTerdell/zod-to-json-schema/blob/master/changelog.md)
- [Commits](https://github.com/StefanTerdell/zod-to-json-schema/commits)

---
updated-dependencies:
- dependency-name: zod-to-json-schema
  dependency-type: indirect
  update-type: version-update:semver-patch
...

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