Build(deps): Bump sphinxcontrib-htmlhelp in /dependencies/docs

Bumps [sphinxcontrib-htmlhelp](https://github.com/sphinx-doc/sphinxcontrib-htmlhelp) from 2.0.5 to 2.0.6.
- [Release notes](https://github.com/sphinx-doc/sphinxcontrib-htmlhelp/releases)
- [Changelog](https://github.com/sphinx-doc/sphinxcontrib-htmlhelp/blob/master/CHANGES)
- [Commits](sphinx-doc/sphinxcontrib-htmlhelp@2.0.5...2.0.6)

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

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

Author: dependabot[bot]

dependencies/docs/constraints.txt

@@ -15,7 +15,7 @@ Sphinx==7.4.7
 sphinx-rtd-theme==2.0.0
 sphinxcontrib-applehelp==1.0.8
 sphinxcontrib-devhelp==1.0.6
-sphinxcontrib-htmlhelp==2.0.5
+sphinxcontrib-htmlhelp==2.0.6
 sphinxcontrib-jquery==4.1
 sphinxcontrib-jsmath==1.0.1
 sphinxcontrib-qthelp==1.0.8