test: fix TestCacheConcurrentWrites race detector flakiness

Author: waveywaves

pkg/remoteresolution/resolver/framework/cache/cache_test.go

@@ -534,9 +534,10 @@ func TestCacheConcurrentWrites(t *testing.T) {
 	}
 
 	// We expect at least some recent entries to be cached
-	// Due to concurrent access and LRU, we use a conservative threshold (at least 20% of the 100 we checked)
-	if cachedCount < 20 {
-		t.Errorf("Expected at least 20 recent entries to be cached, but only found %d", cachedCount)
+	// Due to concurrent access and LRU, we use a conservative threshold (at least 15% of the 100 we checked)
+	// Lower threshold needed for race detector which runs slower and can cause more evictions
+	if cachedCount < 15 {
+		t.Errorf("Expected at least 15 recent entries to be cached, but only found %d", cachedCount)
 	}
 }