build(deps): bump sphinx from 3.4.3 to 3.5.0

Bumps [sphinx](https://github.com/sphinx-doc/sphinx) from 3.4.3 to 3.5.0.
- [Release notes](https://github.com/sphinx-doc/sphinx/releases)
- [Changelog](https://github.com/sphinx-doc/sphinx/blob/3.x/CHANGES)
- [Commits](sphinx-doc/sphinx@v3.4.3...v3.5.0)

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

test-requirements.txt

@@ -366,9 +366,9 @@ snowballstemmer==2.1.0 \
     --hash=sha256:b51b447bea85f9968c13b650126a888aabd4cb4463fca868ec596826325dedc2 \
     --hash=sha256:e997baa4f2e9139951b6f4c631bad912dfd3c792467e2f03d7239464af90e914
     # via sphinx
-sphinx==3.4.3 \
-    --hash=sha256:41cad293f954f7d37f803d97eb184158cfd90f51195131e94875bc07cd08b93c \
-    --hash=sha256:c314c857e7cd47c856d2c5adff514ac2e6495f8b8e0f886a8a37e9305dfea0d8
+sphinx==3.5.0 \
+    --hash=sha256:68da66ca3d6b35b22bea5c53d938d5f8988663dca042f0a46429a1eba1010051 \
+    --hash=sha256:deb468efb3abaa70d790add4147d18782d86fdeacf648d6e8afb7a99807f1546
     # via -r test-requirements.in
 sphinxcontrib-applehelp==1.0.2 \
     --hash=sha256:806111e5e962be97c29ec4c1e7fe277bfd19e9652fb1a4392105b43e01af885a \