Bump some docs dependencies to resolve a Dependabot security alert (#107341)

Author: AlexWaygood

Doc/requirements-oldest-sphinx.txt

@@ -14,11 +14,10 @@ python-docs-theme>=2022.1
 # Docutils<0.17, Jinja2<3, and MarkupSafe<2 are additionally specified as
 # Sphinx 3.2 is incompatible with newer releases of these packages.
 
-Sphinx==3.2.1
 alabaster==0.7.13
 Babel==2.12.1
-certifi==2022.12.7
-charset-normalizer==3.1.0
+certifi==2023.7.22
+charset-normalizer==3.2.0
 colorama==0.4.6
 docutils==0.16
 idna==3.4
@@ -29,10 +28,11 @@ packaging==23.1
 Pygments==2.15.1
 requests==2.31.0
 snowballstemmer==2.2.0
+Sphinx==3.2.1
 sphinxcontrib-applehelp==1.0.4
 sphinxcontrib-devhelp==1.0.2
 sphinxcontrib-htmlhelp==2.0.1
 sphinxcontrib-jsmath==1.0.1
 sphinxcontrib-qthelp==1.0.3
 sphinxcontrib-serializinghtml==1.1.5
-urllib3==1.26.15
+urllib3==2.0.4