Bump up spark version 2.3.2 to 2.3.3 for docker

When building docker images, spark is installed as dependency.
spark spark-2.3.2 is no longer available and back-compatible spark-2.3.3
is used instead.

Change-Id: I243f071482922fa4961ca829f59d360e3444b209

project/SharedSettings.scala

diff --git a/project/SharedSettings.scala b/project/SharedSettings.scala
index 3c05034..730debc 100644
--- a/project/SharedSettings.scala
+++ b/project/SharedSettings.scala
@@ -92,7 +92,7 @@
 }
 
 object Versions {
-  val sparkVersion = "2.3.2"
+  val sparkVersion = "2.3.3"
   val gerritApiVersion = "2.13.7"
   val esSpark = "6.2.0"
   val scalaLogging = "3.7.2"