Bump spec_tests/hed-specification from 5465995 to 5bc506c

Bumps [spec_tests/hed-specification](https://github.com/hed-standard/hed-specification) from `5465995` to `5bc506c`.
- [Release notes](https://github.com/hed-standard/hed-specification/releases)
- [Commits](hed-standard/hed-specification@5465995...5bc506c)

---
updated-dependencies:
- dependency-name: spec_tests/hed-specification
  dependency-type: direct:production
...

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