Fumbling attempt to fix docs

docs/requirements.txt

@@ -1,10 +1,8 @@
 # What we want
-Sphinx==4.2.0
-sphinx-rtd-theme==1.0.0
+Sphinx==4.3.0
 
 # What we get
 alabaster==0.7.12
-appdirs==1.4.4
 Babel==2.9.1
 certifi==2021.10.8
 charset-normalizer==2.0.7
@@ -13,13 +11,13 @@ idna==3.3
 imagesize==1.3.0
 Jinja2==3.0.3
 MarkupSafe==2.0.1
-packaging==20.3
+packaging==21.2
 Pygments==2.10.0
 pyparsing==2.4.7
 pytz==2021.3
 requests==2.26.0
-six==1.14.0
-snowballstemmer==2.1.0
+six==1.16.0
+snowballstemmer==2.2.0
 sphinxcontrib-applehelp==1.0.2
 sphinxcontrib-devhelp==1.0.2
 sphinxcontrib-htmlhelp==2.0.0