Bump spec_tests/hed-specification from dcd2b54 to 8e78802

Bumps [spec_tests/hed-specification](https://github.com/hed-standard/hed-specification) from `dcd2b54` to `8e78802`.
- [Release notes](https://github.com/hed-standard/hed-specification/releases)
- [Commits](hed-standard/hed-specification@dcd2b54...8e78802)

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

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Author: dependabot[bot]