Upgrade store REST API version to 2019-12-12

- Contributed by Sneha Vijayarajan

hadoop-tools/hadoop-azure/src/main/java/org/apache/hadoop/fs/azurebfs/services/AbfsClient.java

@@ -62,7 +62,7 @@ public class AbfsClient implements Closeable {
   public static final Logger LOG = LoggerFactory.getLogger(AbfsClient.class);
   private final URL baseUrl;
   private final SharedKeyCredentials sharedKeyCredentials;
-  private final String xMsVersion = "2018-11-09";
+  private final String xMsVersion = "2019-12-12";
   private final ExponentialRetryPolicy retryPolicy;
   private final String filesystem;
   private final AbfsConfiguration abfsConfiguration;