Use correct format specifier

uint64 should use UINT64_FORMAT instead of %lu because format specifier
depends on a type probe. It suppresses a compiler warning.

wal2json.c

@@ -740,7 +740,7 @@ pg_decode_commit_txn_v1(LogicalDecodingContext *ctx, ReorderBufferTXN *txn,
 		elog(DEBUG2, "txn has catalog changes: yes");
 	else
 		elog(DEBUG2, "txn has catalog changes: no");
-	elog(DEBUG2, "my change counter: %lu ; # of changes: %lu ; # of changes in memory: %lu", data->nr_changes, txn->nentries, txn->nentries_mem);
+	elog(DEBUG2, "my change counter: " UINT64_FORMAT " ; # of changes: " UINT64_FORMAT " ; # of changes in memory: " UINT64_FORMAT, data->nr_changes, txn->nentries, txn->nentries_mem);
 	elog(DEBUG2, "# of subxacts: %d", txn->nsubtxns);
 
 	/* Transaction ends */