Upgrade spark_2.11 to 2.4.6 (#175)

Co-authored-by: Ramanathan Ramu <[email protected]>

Author: ramurm2013-droid

defaultEnvironment.gradle

@@ -10,6 +10,6 @@ subprojects {
   project.ext.setProperty('trino-version', '446')
   project.ext.setProperty('airlift-slice-version', '0.44')
   project.ext.setProperty('spark-group', 'org.apache.spark')
-  project.ext.setProperty('spark2-version', '2.3.0')
+  project.ext.setProperty('spark2-version', '2.4.6')
   project.ext.setProperty('spark3-version', '3.1.1')
 }

transportable-udfs-plugin/build.gradle

@@ -24,7 +24,7 @@ def writeVersionInfo = { file ->
     entry(key: "transport-version", value: version)
     entry(key: "hive-version", value: '1.2.2')
     entry(key: "trino-version", value: '446')
-    entry(key: "spark_2.11-version", value: '2.3.0')
+    entry(key: "spark_2.11-version", value: '2.4.6')
     entry(key: "spark_2.12-version", value: '3.1.1')
     entry(key: "scala-version", value: '2.11.8')
   }