Fix JSON trailing comma

blank-canvas-3/theme.json

@@ -304,5 +304,5 @@
 		}
 	],
 	"version": 2,
-	"$schema": "https://schemas.wp.org/wp/6.1/theme.json"
+	"$schema": "https://schemas.wp.org/wp/6.1/theme.json",
 }