style: Fix checkstyle warning

Author: g3n35i5

client/src/main/java/com/influxdb/client/write/Point.java

@@ -29,8 +29,8 @@
 import java.util.Locale;
 import java.util.Map;
 import java.util.Set;
-import java.util.TreeMap;
 import java.util.Collections;
+import java.util.TreeMap;
 import java.util.concurrent.TimeUnit;
 import java.util.stream.Collectors;
 import java.util.stream.Stream;