[core] Switch to ankerl::unordered_dense

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

libs/search/query_params.cpp

@@ -4,7 +4,8 @@
 #include "search/token_range.hpp"
 
 #include <sstream>
-#include <unordered_map>
+
+#include "3party/ankerl/unordered_dense.h"
 
 namespace search
 {
@@ -15,7 +16,7 @@ namespace
 // All synonyms should be lowercase.
 
 /// @todo These should check the map language and use only the corresponding translation.
-unordered_map<string, vector<string>> const kSynonyms = {
+ankerl::unordered_dense::map<string, vector<string>> const kSynonyms = {
     /// @todo Should process synonyms with errors like "blvrd" -> "blvd".
     /// @see HouseOnStreetSynonymsWithMisprints test.
     {"10a", {"décima"}},