Bump spec_tests/hed-schemas from 28033b9 to 5b6b5c3

Bumps [spec_tests/hed-schemas](https://github.com/hed-standard/hed-schemas) from `28033b9` to `5b6b5c3`.
- [Release notes](https://github.com/hed-standard/hed-schemas/releases)
- [Commits](hed-standard/hed-schemas@28033b9...5b6b5c3)

---
updated-dependencies:
- dependency-name: spec_tests/hed-schemas
  dependency-version: 5b6b5c3321dd862a3425d30da31dbdbda1be9da2
  dependency-type: direct:production
...

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Author: dependabot[bot]