MAINT: Bump sphinx from 3.3.1 to 3.4.1
MAINT: Bump sphinx from 3.3.1 to 3.4.1

Bumps [sphinx](https://github.com/sphinx-doc/sphinx) from 3.3.1 to 3.4.1.
- [Release notes](https://github.com/sphinx-doc/sphinx/releases)
- [Changelog](https://github.com/sphinx-doc/sphinx/blob/3.x/CHANGES)
- [Commits](https://github.com/sphinx-doc/sphinx/compare/v3.3.1...v3.4.1)

Signed-off-by: dependabot-preview[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
madphysicist/numpy,madphysicist/numpy,mattip/numpy,jakirkham/numpy,jakirkham/numpy,mattip/numpy,mhvk/numpy,endolith/numpy,pdebuyl/numpy,numpy/numpy,anntzer/numpy,simongibbons/numpy,charris/numpy,mhvk/numpy,pbrod/numpy,numpy/numpy,endolith/numpy,anntzer/numpy,seberg/numpy,seberg/numpy,simongibbons/numpy,madphysicist/numpy,mattip/numpy,jakirkham/numpy,endolith/numpy,seberg/numpy,pbrod/numpy,madphysicist/numpy,pbrod/numpy,simongibbons/numpy,charris/numpy,charris/numpy,mattip/numpy,charris/numpy,mhvk/numpy,jakirkham/numpy,pbrod/numpy,mhvk/numpy,pdebuyl/numpy,simongibbons/numpy,numpy/numpy,rgommers/numpy,pdebuyl/numpy,endolith/numpy,madphysicist/numpy,numpy/numpy,rgommers/numpy,jakirkham/numpy,pdebuyl/numpy,pbrod/numpy,anntzer/numpy,rgommers/numpy,rgommers/numpy,seberg/numpy,mhvk/numpy,simongibbons/numpy,anntzer/numpy