Bump hadoop-client from 2.2.0 to 2.7.0 in /tpcds-gen

Bumps hadoop-client from 2.2.0 to 2.7.0.

---
updated-dependencies:
- dependency-name: org.apache.hadoop:hadoop-client
  dependency-type: direct:production
...

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

tpcds-gen/pom.xml

@@ -19,7 +19,7 @@
     <dependency>
       <groupId>org.apache.hadoop</groupId>
       <artifactId>hadoop-client</artifactId>
-      <version>2.2.0</version>
+      <version>2.7.0</version>
       <scope>compile</scope>
     </dependency>
     <dependency>