Upgrading spark_version->3.1.2

Author: Darek

pyspark-notebook/Dockerfile

@@ -13,9 +13,9 @@ USER root
 # Spark dependencies
 # Default values can be overridden at build time
 # (ARGS are in lower case to distinguish them from ENV)
-ARG spark_version="3.1.1"
+ARG spark_version="3.1.2"
 ARG hadoop_version="3.2"
-ARG spark_checksum="E90B31E58F6D95A42900BA4D288261D71F6C19FA39C1CB71862B792D1B5564941A320227F6AB0E09D946F16B8C1969ED2DEA2A369EC8F9D2D7099189234DE1BE"
+ARG spark_checksum="2385CB772F21B014CE2ABD6B8F5E815721580D6E8BC42A26D70BBCDDA8D303D886A6F12B36D40F6971B5547B70FAE62B5A96146F0421CB93D4E51491308EF5D5"
 ARG openjdk_version="11"
 
 ENV APACHE_SPARK_VERSION="${spark_version}" \