chore(deps): update dependency sphinxcontrib-htmlhelp to v2.1.0

Author: renovate[bot]

docs/requirements.txt

@@ -58,7 +58,7 @@ sphinx-rtd-theme==1.3.0 ; python_version >= "3.8" and python_version < "4.0"
 sphinx==6.2.1 ; python_version >= "3.8" and python_version < "4.0"
 sphinxcontrib-applehelp==1.0.4 ; python_version >= "3.8" and python_version < "4.0"
 sphinxcontrib-devhelp==1.0.2 ; python_version >= "3.8" and python_version < "4.0"
-sphinxcontrib-htmlhelp==2.0.1 ; python_version >= "3.8" and python_version < "4.0"
+sphinxcontrib-htmlhelp==2.1.0 ; python_version >= "3.8" and python_version < "4.0"
 sphinxcontrib-jquery==4.1 ; python_version >= "3.8" and python_version < "4.0"
 sphinxcontrib-jsmath==1.0.1 ; python_version >= "3.8" and python_version < "4.0"
 sphinxcontrib-qthelp==1.0.3 ; python_version >= "3.8" and python_version < "4.0"