[Blockchain Watcher] (FIX - SUI) Fix currentCheckpoint value for report metrics on grafana (#1345)

Fix currentCheckpoint value

Co-authored-by: julian merlo <julianmerlo@julians-MacBook-Pro.local>

blockchain-watcher/src/domain/actions/sui/PollSuiTransactions.ts

@@ -75,6 +75,7 @@ export class PollSuiTransactions extends RunPollingJob {
       `[sui][PollSuiTransactions] Got ${txs.length} txs from ${this.cursor.checkpoint} to ${newCursor.checkpoint}`
     );
 
+    this.currentCheckpoint = this.cursor.checkpoint;
     this.cursor = newCursor;
 
     return txs;