Increase max_bytes_before_external_group_by for 00165_jit_aggregate_functions

tests/queries/1_stateful/00165_jit_aggregate_functions.sql

@@ -1,6 +1,8 @@
 SET compile_aggregate_expressions = 1;
 SET min_count_to_compile_aggregate_expression = 0;
-SET max_bytes_before_external_group_by='200M'; -- might be randomized to 1 leading to timeout
+-- The test uses many aggregations. A low max_bytes_before_external_group_by value will lead to high disk usage
+-- which in CI leads to timeouts
+SET max_bytes_before_external_group_by=0;
 
 SELECT 'Aggregation using JIT compilation';