CI: add an error true to the valid data check

Author: chendaniely

book/lectures/135-data_validation-python-pandera.qmd

@@ -273,7 +273,9 @@ invalid_data = pd.DataFrame({
 Let's see what happens when we apply `pa.DataFrameSchema.validate`
 to our valid data:
 
+<!-- TODO: should not need to error true this line, but trying to fix CI-->
 ```{python}
+#| error: true
 schema.validate(valid_data)
 ```