Revert "Bump pyspark from 2.4.4 to 3.1.3 in /Knowage-Python (#540)"

This reverts commit 500a5fa2.

Revert "Bump pyspark from 2.4.4 to 3.1.3 in /Knowage-Python (#540)"
This reverts commit 500a5fa2.
6b7bf11b · Marco Libanori · 4de89161 · 6b7bf11b
Commit 6b7bf11b authored Jun 14, 2022 by Marco Libanori
--- a/Knowage-Python/requirements.txt
+++ b/Knowage-Python/requirements.txt
@@ -51,7 +51,7 @@ PyJWT==2.4.0
 Pympler==0.9
 pyOpenSSL==19.1.0
 pyparsing==2.4.2
-pyspark==3.1.3
+pyspark==2.4.4
 python-dateutil==2.8.0
 pytz==2019.3
 pywin32-ctypes==0.2.0