[Dependabot]: Update sphinx-copybutton requirement

Updates the requirements on [sphinx-copybutton](https://github.com/executablebooks/sphinx-copybutton) to permit the latest version.
- [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...v0.5.2)

---
updated-dependencies:
- dependency-name: sphinx-copybutton
  dependency-version: 0.5.2
  dependency-type: direct:production
...

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

Author: dependabot[bot]

doc/requirements.txt

@@ -12,5 +12,5 @@ sphinx_rtd_theme ~= 3.1
 sphinxcontrib-mermaid ~= 2.0
 autoapi ~= 2.0.1
 sphinx_design ~= 0.7.0
-sphinx-copybutton ~= 0.5.0
+sphinx-copybutton ~= 0.5.2
 sphinx_autodoc_typehints ~= 3.6