Update to Parquet 1.8.2 (apache#4210)

Hi guys,

Since Spark 2.x uses Parquet 1.8.2, we would like to update Druid's parquet library from 1.8.1 to 1.8.2 as well. It includes a lot of patches, performance improvements and better compatibility:
apache/parquet-java@4aba4da...c652278

Cheers, Fokko

extensions-contrib/parquet-extensions/pom.xml

@@ -25,7 +25,7 @@
         <dependency>
             <groupId>org.apache.parquet</groupId>
             <artifactId>parquet-avro</artifactId>
-            <version>1.8.1</version>
+            <version>1.8.2</version>
         </dependency>
         <dependency>
             <groupId>io.druid</groupId>