Relax swisstable density tests to make them future proof for the changing maximum load factor in Abseil hash table

PiperOrigin-RevId: 784149451
Change-Id: I208d6bb6415119d41dc5a209c1ff6640f6f5d47b

Author: goldvitaly

fleetbench/swissmap/swissmap_benchmark_test.cc

@@ -24,11 +24,11 @@ namespace fleetbench {
 TEST(SwissmapBenchmarkTest, Density) {
   auto set1 = GenerateSet<absl::flat_hash_set<Value<4>, Hash, Eq>>(
       1 << 10, Density::kMin);
-  EXPECT_NEAR(set1.load_factor(), 0.4375, 0.01);
+  EXPECT_LT(set1.load_factor(), 0.5);
 
   auto set2 = GenerateSet<absl::flat_hash_set<Value<4>, Hash, Eq>>(
       1 << 10, Density::kMax);
-  EXPECT_NEAR(set2.load_factor(), 0.875, 0.01);
+  EXPECT_GT(set2.load_factor(), 0.8);
 }
 
 TEST(SwissmapBenchmarkTest, GenerateSets) {