Network protocol is already smart enough to send city name as NULL-terminated string, and not a fixed size array. So nothing to do for that.
Second thing considered was that city name could be moved to a packet of its own to avoid too big PACKET_CITY_INFO. For that part, there's a couple of much worse offenders -> will open a new tickets about those.
City name as part of PACKET_CITY_INFO isn't problem in S3_1. Let's recheck the situation before 3.2, especially if MAX_LEN_CITYNAME gets increased -> retargeting to S3_2-npf
Likely the network protocol could be made better concerning city names (in city_info etc), esp. after #45786 and #45844