Bumps [sphinx-copybutton](https://github.com/executablebooks/sphinx-copybutton) from 0.3.1 to 0.3.3.
- [Release notes](https://github.com/executablebooks/sphinx-copybutton/releases)
- [Changelog](https://github.com/executablebooks/sphinx-copybutton/blob/master/CHANGELOG.md)
- [Commits](executablebooks/sphinx-copybutton@v0.3.1...v0.3.3)

---
updated-dependencies:
- dependency-name: sphinx-copybutton
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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