Fix initialisation of kakfa offset manager

Author: mpgxvii

kafka-connect-oura-source/src/main/java/org/radarbase/connect/rest/oura/offset/KafkaOffsetManager.java

@@ -36,7 +36,7 @@ public void initialize(List<Map<String, Object>> partitions) {
       .filter(e -> e.getValue() != null && e.getValue().containsKey(TIMESTAMP_OFFSET_KEY))
       .collect(Collectors.toMap(
           e -> (String) e.getKey().get("user") + "-" + e.getKey().get("route"),
-          e -> Instant.ofEpochMilli(((Number) e.getValue().get(TIMESTAMP_OFFSET_KEY)).longValue())));
+          e -> Instant.ofEpochSecond(((Number) e.getValue().get(TIMESTAMP_OFFSET_KEY)).longValue())));
     } else {
       logger.warn("Offset storage reader is null, will resume from an empty state.");
     }