fix: prevent users from settings a growthfactor=1

- This always causes errors, it should not be possible.

cuckoo_fuzz_test.go

@@ -50,7 +50,7 @@ func FuzzInsertLookup(f *testing.F) {
 		}
 
 		seedA, seedB := scenario.seedA, scenario.seedB
-		growthFactor := max(1, int(scenario.growthFactor))
+		growthFactor := max(2, int(scenario.growthFactor))
 		capacity := int(scenario.capacity)
 		minimumLoad := math.Abs(math.Mod(scenario.load, 1.0))