deps: update dependency org.apache.spark:spark-sql_2.11 to v2.4.8 (#176)

Author: renovate-bot

samples/snapshot/pom.xml

@@ -39,7 +39,7 @@
     <dependency>
       <groupId>org.apache.spark</groupId>
       <artifactId>spark-sql_2.11</artifactId>
-      <version>2.4.7</version>
+      <version>2.4.8</version>
     </dependency>
     <dependency>
       <groupId>com.google.cloud</groupId>

samples/snippets/pom.xml

@@ -39,7 +39,7 @@
     <dependency>
       <groupId>org.apache.spark</groupId>
       <artifactId>spark-sql_2.11</artifactId>
-      <version>2.4.7</version>
+      <version>2.4.8</version>
     </dependency>
     <dependency>
       <groupId>com.google.cloud</groupId>