docs: update docs dependencies

Sphinx 4 is too old for Python 3.10

docs/requirements.txt

@@ -1,10 +1,10 @@
-Sphinx==4.2.0
-sphinx-autodoc-typehints==1.12.0
-sphinx-jsonschema==1.16.11
-sphinx-pydantic==0.1.1
-sphinx-rtd-theme==1.0.0
-sphinxcontrib-applehelp==1.0.2
-sphinxcontrib-devhelp==1.0.2
-sphinxcontrib-htmlhelp==2.0.0
-sphinxcontrib-jsmath==1.0.1
-sphinxcontrib-qthelp==1.0.3
+Sphinx
+sphinx-autodoc-typehints
+sphinx-jsonschema
+sphinx-pydantic
+sphinx-rtd-theme
+sphinxcontrib-applehelp
+sphinxcontrib-devhelp
+sphinxcontrib-htmlhelp
+sphinxcontrib-jsmath
+sphinxcontrib-qthelp