lmdb: fix warnings about deprecated methods

Signed-off-by: Yuki Kishimoto <[email protected]>

Author: yukibtc

database/nostr-lmdb/src/lib.rs

@@ -919,7 +919,7 @@ mod tests {
 
         // Confirm both events have the same timestamp
         assert_eq!(event1.created_at, event2.created_at);
-        assert_eq!(event1.created_at.as_u64(), 1754066538);
+        assert_eq!(event1.created_at.as_secs(), 1754066538);
 
         // Confirm event1 has the smaller ID (lexicographically first)
         assert!(event1.id.to_string() < event2.id.to_string());
@@ -1003,7 +1003,7 @@ mod tests {
 
         // Confirm both events have the same timestamp and d-tag
         assert_eq!(event1.created_at, event2.created_at);
-        assert_eq!(event1.created_at.as_u64(), 1754066538);
+        assert_eq!(event1.created_at.as_secs(), 1754066538);
         assert_eq!(event1.tags.identifier(), event2.tags.identifier());
         assert_eq!(event1.tags.identifier(), Some("article-123"));