[core] Switch to ankerl::unordered_dense

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

libs/editor/changeset_wrapper.cpp

@@ -245,7 +245,7 @@ void ChangesetWrapper::AddChangesetTag(std::string key, std::string value)
 {
   value = strings::EscapeForXML(value);
 
-  //OSM has a length limit of 255 characters
+  // OSM has a length limit of 255 characters
   if (value.length() > kMaximumOsmChars)
   {
     LOG(LWARNING, ("value is too long for OSM 255 char limit: ", value));