fix clippy warning

Author: lovasoa

src/webserver/database/sql_to_json.rs

@@ -234,7 +234,7 @@ mod tests {
                 "big_int": 42,
                 "float4": 42.25,
                 "float8": 42.25,
-                "numeric": 123456789123456789123456789_u128,
+                "numeric": 123_456_789_123_456_789_123_456_789_u128,
                 "boolean": true,
                 "date": "2024-03-14",
                 "time": "13:14:15",