Bump sphinx from 3.3.1 to 3.4.0

Bumps [sphinx](https://github.com/sphinx-doc/sphinx) from 3.3.1 to 3.4.0.
- [Release notes](https://github.com/sphinx-doc/sphinx/releases)
- [Changelog](https://github.com/sphinx-doc/sphinx/blob/3.x/CHANGES)
- [Commits](sphinx-doc/sphinx@v3.3.1...v3.4.0)

Signed-off-by: dependabot[bot] <support@github.com>

docs_requirements.txt

@@ -64,7 +64,7 @@ scipy==1.5.4
 Send2Trash==1.5.0
 six==1.15.0
 snowballstemmer==2.0.0
-Sphinx==3.3.1
+Sphinx==3.4.0
 sphinx-jsonschema==1.16.6
 sphinx-rtd-theme==0.5.0
 sphinxcontrib-applehelp==1.0.2

science_requirements.txt

@@ -91,7 +91,7 @@ rope==0.18.0
 six==1.15.0
 snowballstemmer==2.0.0
 sortedcontainers==2.3.0
-Sphinx==3.3.1
+Sphinx==3.4.0
 sphinxcontrib-applehelp==1.0.2
 sphinxcontrib-devhelp==1.0.2
 sphinxcontrib-htmlhelp==1.0.3