The work of M.O. Katanaev was performed at the Steklov International Mathematical
Center and supported by the Ministry of Science and Higher Education of the Russian Federation
(agreement no. 075-15-2022-265).
Поступила в редакцию: 20.10.2023 Исправленный вариант: 23.11.2023 Принята в печать: 27.11.2023