Upgrade sphinx to 7 and bump all other docs dependencies

docs/conf.py

@@ -100,7 +100,7 @@ def get_dirtyfields_version():
 #
 # This is also used if you do content translation via gettext catalogs.
 # Usually you set "language" from the command line for these cases.
-language = None
+language = "en"
 
 # There are two options for replacing |today|: either, you set today to some
 # non-false value, then it is used:

docs/requirements.txt

@@ -4,53 +4,51 @@
 #
 #    pip-compile requirements.in
 #
-alabaster==0.7.12
+alabaster==0.7.13
     # via sphinx
-babel==2.9.1
+babel==2.13.0
     # via sphinx
-certifi==2022.12.7
+certifi==2023.7.22
     # via requests
-charset-normalizer==2.0.12
+charset-normalizer==3.3.0
     # via requests
-docutils==0.17.1
+docutils==0.20.1
     # via sphinx
-idna==3.3
+idna==3.4
     # via requests
-imagesize==1.3.0
+imagesize==1.4.1
     # via sphinx
-importlib-metadata==4.11.3
+importlib-metadata==6.8.0
     # via sphinx
-jinja2==3.1.1
+jinja2==3.1.2
     # via sphinx
-markupsafe==2.1.1
+markupsafe==2.1.3
     # via jinja2
-packaging==21.3
+packaging==23.2
     # via sphinx
-pygments==2.11.2
+pygments==2.16.1
     # via sphinx
-pyparsing==3.0.7
-    # via packaging
-pytz==2022.1
+pytz==2023.3.post1
     # via babel
-requests==2.27.1
+requests==2.31.0
     # via sphinx
 snowballstemmer==2.2.0
     # via sphinx
-sphinx==4.4.0
+sphinx==7.1.2
     # via -r requirements.in
-sphinxcontrib-applehelp==1.0.2
+sphinxcontrib-applehelp==1.0.4
     # via sphinx
 sphinxcontrib-devhelp==1.0.2
     # via sphinx
-sphinxcontrib-htmlhelp==2.0.0
+sphinxcontrib-htmlhelp==2.0.1
     # via sphinx
 sphinxcontrib-jsmath==1.0.1
     # via sphinx
 sphinxcontrib-qthelp==1.0.3
     # via sphinx
 sphinxcontrib-serializinghtml==1.1.5
     # via sphinx
-urllib3==1.26.9
+urllib3==2.0.7
     # via requests
-zipp==3.7.0
+zipp==3.17.0
     # via importlib-metadata