v4.0.4
[SPARK-58033][PYTHON][DOC] Fix `py4j` version requirement in PySpark installation guide
[SPARK-52026][PS][4.0] Block pandas API on Spark on ANSI mode by default
[SPARK-36739][DOCS][PYTHON] Add apache license headers to makefiles
[SPARK-50821][PYTHON] Upgrade Py4J from 0.10.9.8 to 0.10.9.9