Bug 1683628 - Update dependency Sphinx to v3.4.0 r=firefox-source-docs-reviewers,championshuttler DONTBUILD

Found by renovate bot: https://github.com/sylvestre/gecko-dev/pull/128/files

Differential Revision: https://phabricator.services.mozilla.com/D100228

tools/moztreedocs/requirements.in

@@ -40,7 +40,7 @@ sentry-sdk==0.14.3
 singledispatch==3.4.0.3
 six==1.15.0
 snowballstemmer==2.0.0
-Sphinx==3.3.1
+Sphinx==3.4.0
 sphinx-copybutton==0.3.1
 sphinx-js==3.0.1
 sphinx-markdown-tables==0.0.15

tools/moztreedocs/requirements.txt

@@ -236,10 +236,9 @@ sphinx-rtd-theme==0.5.0 \
     --hash=sha256:22c795ba2832a169ca301cd0a083f7a434e09c538c70beb42782c073651b707d \
     --hash=sha256:373413d0f82425aaa28fb288009bf0d0964711d347763af2f1b65cafcb028c82 \
     # via -r requirements.in
-sphinx==3.3.1 \
-    --hash=sha256:1e8d592225447104d1172be415bc2972bd1357e3e12fdc76edf2261105db4300 \
-    --hash=sha256:d4e59ad4ea55efbb3c05cde3bfc83bfc14f0c95aa95c3d75346fcce186a47960 \
-    # via -r requirements.in, recommonmark, sphinx-copybutton, sphinx-js, sphinx-rtd-theme
+Sphinx==3.4.0 \
+    --hash=sha256:4dcde313801f23ea4789ac31e5405e240cb758b5d375804807f2f3cc3c396bfa \
+    --hash=sha256:77c801947eb86457822e01eadd5c2e2de020db0201f1f9fc98b0927980b6d212
 sphinxcontrib-applehelp==1.0.2 \
     --hash=sha256:806111e5e962be97c29ec4c1e7fe277bfd19e9652fb1a4392105b43e01af885a \
     --hash=sha256:a072735ec80e7675e3f432fcae8610ecf509c5f1869d17e2eecff44389cdbc58 \