Add missing dependency (#678)

pyproject.toml

@@ -70,7 +70,8 @@ docs = [
     "sphinxemoji==0.2.0",
     "sphinx-argparse==0.3.1",
     "sphinx-copybutton==0.5.0",
-    "sphinx-design==0.2.0"
+    "sphinx-design==0.2.0",
+    "sphinxext-opengraph==0.6.3"
 ]
 
 [project.scripts]