Bump docspec from 1.2.0 to 1.3.0 (#5610)

Bumps [docspec](https://github.com/NiklasRosenstein/docspec) from 1.2.0 to 1.3.0.
- [Release notes](https://github.com/NiklasRosenstein/docspec/releases)
- [Commits](NiklasRosenstein/python-docspec@1.2.0...1.3.0)

---
updated-dependencies:
- dependency-name: docspec
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Dirk Groeneveld <dirkg@allenai.org>

dev-requirements.txt

@@ -36,7 +36,7 @@ ruamel.yaml
 # Generating markdown files from Python modules.
 pydoc-markdown>=4.0.0,<5.0.0
 databind.core
-docspec==1.2.0
+docspec==1.3.0
 docspec-python==1.2.0
 
 mkdocs==1.2.3