Fix flakey latency test

This test is intended to catch very broken queries, but it is too sensitive
and doesnt account for variance caused by other factors (genreal ambient
compute fluctuations, etc).

Raising it will unblock others while hopefully also continuing to catch
actual breaking changes to queries

tests/search/vespa/test_vespa_search.py

@@ -159,7 +159,7 @@ def test_benchmark_families_search(
     _populate_db_families(data_db)
 
     # This is high as it's meant as a last resort for catching new performance problems
-    REASONABLE_LATENCY_MS = 50
+    REASONABLE_LATENCY_MS = 100
 
     times = []
     for _ in range(1, 10):