Updated files with 'repo_helper'.

doc-source/requirements.txt

@@ -10,7 +10,7 @@ pytz>=2019.1
 seed-intersphinx-mapping>=1.2.2
 sphinx>=3.0.3
 sphinx-autofixture>=0.2.1
-sphinx-copybutton>=0.2.12
+sphinx-copybutton>=0.5.2
 sphinx-debuginfo>=0.2.2
 sphinx-highlights>=0.1.0
 sphinx-licenseinfo>=0.3.1