Docs: build with Sphinx 5 (#5121)

* Docs: build with Sphinx 5

* Sphinx 5 no longer accepts language = None
Co-authored-by: Nicolas Hug <contact@nicolas-hug.com>

docs/requirements.txt

@@ -2,8 +2,6 @@ matplotlib
 numpy
 sphinx-copybutton>=0.3.1
 sphinx-gallery>=0.9.0
-sphinx==3.5.4
+sphinx==5.0.0
 tabulate
-# This pin is only needed for sphinx<4.0.2. See https://github.com/pytorch/vision/issues/5673 for details
-Jinja2<3.1.*
 -e git+https://github.com/pytorch/pytorch_sphinx_theme.git#egg=pytorch_sphinx_theme

docs/source/conf.py

@@ -103,7 +103,7 @@ if 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"
 
 # List of patterns, relative to source directory, that match files and
 # directories to ignore when looking for source files.