build: add sphinx-copybutton to requirements.txt

Signed-off-by: Akshay Mestry <[email protected]>

Author: xames3

requirements.txt

@@ -37,6 +37,7 @@ snowballstemmer==2.2.0
 soupsieve==2.6
 Sphinx==8.2.1
 sphinx-carousel==1.2.0
+sphinx-copybutton==0.5.2
 sphinx-docsearch==0.1.0
 sphinx-lint==1.0.0
 sphinx_design==0.6.1