Update requirements for documentation building

docs/requirements.txt

@@ -1,5 +1,5 @@
 #
-# This file is autogenerated by pip-compile
+# This file is autogenerated by pip-compile with python 3.8
 # To update, run:
 #
 #    pip-compile --output-file=docs/requirements.txt docs/requirements.in
@@ -8,37 +8,39 @@ alabaster==0.7.12
     # via sphinx
 babel==2.9.1
     # via sphinx
-certifi==2021.5.30
+certifi==2021.10.8
     # via requests
-chardet==4.0.0
+charset-normalizer==2.0.12
     # via requests
 docutils==0.17.1
     # via sphinx
-idna==2.10
+idna==3.3
     # via requests
-imagesize==1.2.0
+imagesize==1.3.0
     # via sphinx
-jinja2==3.0.1
+importlib-metadata==4.11.3
     # via sphinx
-markupsafe==2.0.1
+jinja2==3.1.1
+    # via sphinx
+markupsafe==2.1.1
     # via jinja2
-packaging==20.9
+packaging==21.3
     # via
     #   pallets-sphinx-themes
     #   sphinx
-pallets-sphinx-themes==2.0.1
+pallets-sphinx-themes==2.0.2
     # via -r docs/requirements.in
-pygments==2.9.0
+pygments==2.11.2
     # via sphinx
-pyparsing==2.4.7
+pyparsing==3.0.8
     # via packaging
-pytz==2021.1
+pytz==2022.1
     # via babel
-requests==2.25.1
+requests==2.27.1
     # via sphinx
-snowballstemmer==2.1.0
+snowballstemmer==2.2.0
     # via sphinx
-sphinx==4.0.2
+sphinx==4.5.0
     # via
     #   -r docs/requirements.in
     #   pallets-sphinx-themes
@@ -54,8 +56,7 @@ sphinxcontrib-qthelp==1.0.3
     # via sphinx
 sphinxcontrib-serializinghtml==1.1.5
     # via sphinx
-urllib3==1.26.5
+urllib3==1.26.9
     # via requests
-
-# The following packages are considered to be unsafe in a requirements file:
-# setuptools
+zipp==3.8.0
+    # via importlib-metadata