Update docs requirements, particularly for Sphinx 5.

Author: Julian

docs/requirements.txt

@@ -8,17 +8,17 @@ alabaster==0.7.12
     # via sphinx
 attrs==21.4.0
     # via jsonschema
-babel==2.10.1
+babel==2.10.3
     # via sphinx
 beautifulsoup4==4.11.1
     # via furo
-certifi==2022.5.18.1
+certifi==2022.6.15
     # via requests
 charset-normalizer==2.0.12
     # via requests
-docutils==0.17.1
+docutils==0.18.1
     # via sphinx
-furo==2022.4.7
+furo==2022.6.4.1
     # via -r docs/requirements.in
 idna==3.3
     # via requests
@@ -46,20 +46,23 @@ pyrsistent==0.18.1
     # via jsonschema
 pytz==2022.1
     # via babel
-requests==2.27.1
+requests==2.28.0
     # via sphinx
 snowballstemmer==2.2.0
     # via sphinx
 soupsieve==2.3.2.post1
     # via beautifulsoup4
-sphinx==4.5.0
+sphinx==5.0.2
     # via
     #   -r docs/requirements.in
     #   furo
     #   sphinx-autodoc-typehints
+    #   sphinx-basic-ng
     #   sphinxcontrib-spelling
-sphinx-autodoc-typehints==1.18.1
+sphinx-autodoc-typehints==1.18.3
     # via -r docs/requirements.in
+sphinx-basic-ng==0.0.1a11
+    # via furo
 sphinxcontrib-applehelp==1.0.2
     # via sphinx
 sphinxcontrib-devhelp==1.0.2