rpc: fix GetBlockTransactionCountByNumber with Pending (#19335)

When blockNr is set to rpc.PendingBlockNumber (-1), performing a direct
conversion via .Uint64() results in an integer overflow. This transforms
the special 'pending' tag into a literal, extremely large block number
(2^{64}-1). Consequently, the blockByNumberWithSenders() function fails
to recognize it as a special case and attempts to query a non-existent
block height from the database

Author: lupin012

rpc/jsonrpc/eth_block.go

@@ -345,7 +345,7 @@ func (api *APIImpl) GetBlockTransactionCountByNumber(ctx context.Context, blockN
 	defer tx.Rollback()
 
 	if blockNr == rpc.PendingBlockNumber {
-		b, err := api.blockByNumberWithSenders(ctx, tx, blockNr.Uint64())
+		b, err := api.blockByNumber(ctx, blockNr, tx)
 		if err != nil {
 			return nil, err
 		}