Update to Scala 2.12.8

Author: srowen

dev/deps/spark-deps-hadoop-2.7

@@ -171,10 +171,10 @@ parquet-jackson-1.10.0.jar
 protobuf-java-2.5.0.jar
 py4j-0.10.8.1.jar
 pyrolite-4.13.jar
-scala-compiler-2.12.7.jar
-scala-library-2.12.7.jar
+scala-compiler-2.12.8.jar
+scala-library-2.12.8.jar
 scala-parser-combinators_2.12-1.1.0.jar
-scala-reflect-2.12.7.jar
+scala-reflect-2.12.8.jar
 scala-xml_2.12-1.0.5.jar
 shapeless_2.12-2.3.2.jar
 slf4j-api-1.7.16.jar

dev/deps/spark-deps-hadoop-3.1

@@ -189,10 +189,10 @@ protobuf-java-2.5.0.jar
 py4j-0.10.8.1.jar
 pyrolite-4.13.jar
 re2j-1.1.jar
-scala-compiler-2.12.7.jar
-scala-library-2.12.7.jar
+scala-compiler-2.12.8.jar
+scala-library-2.12.8.jar
 scala-parser-combinators_2.12-1.1.0.jar
-scala-reflect-2.12.7.jar
+scala-reflect-2.12.8.jar
 scala-xml_2.12-1.0.5.jar
 shapeless_2.12-2.3.2.jar
 slf4j-api-1.7.16.jar

docs/_config.yml

@@ -17,7 +17,7 @@ include:
 SPARK_VERSION: 3.0.0-SNAPSHOT
 SPARK_VERSION_SHORT: 3.0.0
 SCALA_BINARY_VERSION: "2.12"
-SCALA_VERSION: "2.12.7"
+SCALA_VERSION: "2.12.8"
 MESOS_VERSION: 1.0.0
 SPARK_ISSUE_TRACKER_URL: https://issues.apache.org/jira/browse/SPARK
 SPARK_GITHUB_URL: https://github.com/apache/spark

pom.xml

@@ -156,7 +156,7 @@
     <commons.math3.version>3.4.1</commons.math3.version>
     <!-- managed up from 3.2.1 for SPARK-11652 -->
     <commons.collections.version>3.2.2</commons.collections.version>
-    <scala.version>2.12.7</scala.version>
+    <scala.version>2.12.8</scala.version>
     <scala.binary.version>2.12</scala.binary.version>
     <scalafmt.parameters>--diff --test</scalafmt.parameters>
     <!-- for now, not running scalafmt as part of default verify pipeline -->