Fixes Issue 28593: loki:fuzz_parse_expr: Timeout in fuzz_parse_expr. (#3470)
Fixes Issue 28593: loki:fuzz_parse_expr: Timeout in fuzz_parse_expr. (#3470)

This was caused by a lot of allocations when parsing range duration.

Signed-off-by: Cyril Tovena <1f3b43b4f8eb8a957255fd6382cb431f49248e69@gmail.com>
grafana/loki,grafana/loki,grafana/loki,grafana/loki,grafana/loki,grafana/loki