Bump spark.version from 2.3.0 to 2.4.8

Bumps `spark.version` from 2.3.0 to 2.4.8.

Updates `spark-core_2.11` from 2.3.0 to 2.4.8

Updates `spark-sql_2.11` from 2.3.0 to 2.4.8

Updates `spark-streaming_2.11` from 2.3.0 to 2.4.8

Updates `spark-hive_2.11` from 2.3.0 to 2.4.8

---
updated-dependencies:
- dependency-name: org.apache.spark:spark-core_2.11
  dependency-type: direct:production
- dependency-name: org.apache.spark:spark-sql_2.11
  dependency-type: direct:production
- dependency-name: org.apache.spark:spark-streaming_2.11
  dependency-type: direct:production
- dependency-name: org.apache.spark:spark-hive_2.11
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

pom.xml

@@ -109,7 +109,7 @@
         <servlet.version>3.0.1</servlet.version>
         <slf4j.version>1.7.13</slf4j.version>
         <log4j2.version>2.17.0</log4j2.version>
-        <spark.version>2.3.0</spark.version>
+        <spark.version>2.4.8</spark.version>
         <sqlline.version>1.5.0</sqlline.version>
         <tpcds.version>1.2</tpcds.version>
         <xalan.version>2.7.1</xalan.version>