[core] Switch to ankerl::unordered_dense

Signed-off-by: x7z4w <x7z4w@noreply.codeberg.org>

libs/base/base_tests/bidirectional_map_tests.cpp

@@ -5,7 +5,8 @@
 
 #include <map>
 #include <string>
-#include <unordered_map>
+
+#include "3party/ankerl/unordered_dense.h"
 
 using namespace base;
 using namespace std;