Fix: Python Version 3.8

Author: flo-mair

consumer/run.sh

@@ -1,5 +1,5 @@
 #!/bin/sh
-python3 app/set_properties.py
-`python3 /usr/bin/amazon_kclpy_helper.py --print_command --java /usr/bin/java --properties app/record_processor.properties --log-configuration app/logback.xml` &
+python3.8 app/set_properties.py
+`python3.8 /usr/bin/amazon_kclpy_helper.py --print_command --java /usr/bin/java --properties app/record_processor.properties --log-configuration app/logback.xml` &
 touch /app/logs/record_processor.log
-exec tail -f /app/logs/record_processor.log
+exec tail -f /app/logs/record_processor.log