Build fails for pybind11 3.0.2

After https://github.com/pybind/pybind11/pull/5881 our build fails with:

/home/matveyev/pytango/ext/database/database.cpp:119:42: error: inconsistent types 'pybind11::typing::Tuple<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >&>' and 'pybind11::typing::Tuple<>' deduced for lambda return type
    119 |                     return py::make_tuple();
        |                            ~~~~~~~~~~~~~~^~