Bump sphinx-autobuild from 0.7.1 to 2021.3.14

Bumps [sphinx-autobuild](https://github.com/executablebooks/sphinx-autobuild) from 0.7.1 to 2021.3.14.
- [Release notes](https://github.com/executablebooks/sphinx-autobuild/releases)
- [Changelog](https://github.com/executablebooks/sphinx-autobuild/blob/main/NEWS.rst)
- [Commits](https://github.com/executablebooks/sphinx-autobuild/commits)

---
updated-dependencies:
- dependency-name: sphinx-autobuild
  dependency-type: direct:development
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

requirements-dev.txt

@@ -1,6 +1,6 @@
 ipython==7.16.1
 Sphinx==3.5.4
-sphinx-autobuild==0.7.1
+sphinx-autobuild==2021.3.14
 sphinxcontrib-fulltoc==1.2.0
 nbsphinx==0.7.1