nit: bump up min python to 3.11

Signed-off-by: Mehant Kammakomati <mehant.kammakomati2@ibm.com>

Author: kmehant

plugins/online-data-mixing/.pylintrc

@@ -88,7 +88,7 @@ persistent=yes
 
 # Minimum Python version to use for version dependent checks. Will default to
 # the version used to run pylint.
-py-version=3.9
+py-version=3.11
 
 # Discover python modules and packages in the file system subtree.
 recursive=no