build(deps): bump sphinxcontrib-htmlhelp from 2.0.4 to 2.0.5 in /docs (#3140)

Bumps [sphinxcontrib-htmlhelp](https://github.com/sphinx-doc/sphinxcontrib-htmlhelp) from 2.0.4 to 2.0.5.
- [Release notes](https://github.com/sphinx-doc/sphinxcontrib-htmlhelp/releases)
- [Changelog](https://github.com/sphinx-doc/sphinxcontrib-htmlhelp/blob/2.0.5/CHANGES)
- [Commits](sphinx-doc/sphinxcontrib-htmlhelp@2.0.4...2.0.5)

---
updated-dependencies:
- dependency-name: sphinxcontrib-htmlhelp
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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Author: dependabot[bot]

docs/requirements.txt

@@ -20,7 +20,7 @@ sphinx-favicon==1.0.1
 sphinx-rtd-theme==2.0.0
 sphinxcontrib-applehelp==1.0.8
 sphinxcontrib-devhelp==1.0.5
-sphinxcontrib-htmlhelp==2.0.4
+sphinxcontrib-htmlhelp==2.0.5
 sphinxcontrib-jsmath==1.0.1
 sphinxcontrib-qthelp==1.0.6
 sphinxcontrib-serializinghtml==1.1.9