chore(deps): bump sphinx-copybutton from 0.5.0 to 0.5.1

Bumps [sphinx-copybutton](https://github.com/executablebooks/sphinx-copybutton) from 0.5.0 to 0.5.1.
- [Release notes](https://github.com/executablebooks/sphinx-copybutton/releases)
- [Changelog](https://github.com/executablebooks/sphinx-copybutton/blob/master/CHANGELOG.md)
- [Commits](executablebooks/sphinx-copybutton@v0.5.0...v0.5.1)

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

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