Support MC 1.20.4, improve timestamp exceptions

bukkit/build.gradle

@@ -10,7 +10,7 @@ dependencies {
     implementation 'net.kyori:adventure-platform-bukkit:4.3.1'
     implementation 'dev.triumphteam:triumph-gui:3.1.7'
     implementation 'space.arim.morepaperlib:morepaperlib:0.4.3'
-    implementation 'de.tr7zw:item-nbt-api:2.12.1'
+    implementation 'de.tr7zw:item-nbt-api:2.12.2'
 
     compileOnly 'org.spigotmc:spigot-api:1.16.5-R0.1-SNAPSHOT'
     compileOnly 'commons-io:commons-io:2.15.1'

common/src/main/java/net/william278/husksync/data/DataSnapshot.java

@@ -503,7 +503,10 @@ public class DataSnapshot {
         @NotNull
         public Builder timestamp(@NotNull OffsetDateTime timestamp) {
             if (timestamp.isAfter(OffsetDateTime.now())) {
-                throw new IllegalArgumentException("Data snapshots cannot have a timestamp set in the future");
+                throw new IllegalArgumentException("Data snapshots cannot have a timestamp set in the future! "
+                        + "Make sure your database server time matches the server time.\n"
+                        + "Current game server timestamp: " + OffsetDateTime.now() + " / "
+                        + "Snapshot timestamp: " + timestamp);
             }
             this.timestamp = timestamp;
             return this;