BigtableUploadService: increment start_slot to prevent rechecks (sola…

…na-labs#33870)

Increment start_slot

ledger/src/bigtable_upload_service.rs

@@ -117,7 +117,7 @@ impl BigTableUploadService {
             ));
 
             match result {
-                Ok(last_slot_uploaded) => start_slot = last_slot_uploaded,
+                Ok(last_slot_uploaded) => start_slot = last_slot_uploaded.saturating_add(1),
                 Err(err) => {
                     warn!("bigtable: upload_confirmed_blocks: {}", err);
                     std::thread::sleep(std::time::Duration::from_secs(2));