chore(deps): fix the preview build (#184)

Bump Sphinx to 4.4.0 and pin its compatible extensions.

Author: bfabio

requirements.txt

@@ -1,3 +1,8 @@
-Sphinx==4.3.1
+Sphinx==4.4.0
 sphinx-press-theme==0.8.0
 urllib3==1.26.18
+sphinxcontrib-applehelp==1.0.4
+sphinxcontrib-devhelp==1.0.2
+sphinxcontrib-htmlhelp==2.0.1
+sphinxcontrib-qthelp==1.0.3
+sphinxcontrib-serializinghtml==1.1.5