The Tokyo metropolitan government is planning to ask restaurants that serve alcohol to shorten their operating hours for about three weeks in response to a recent resurgence in coronavirus infections, sources close to the matter said Thursday.The metropolitan government lifted a similar request that such establishments and karaoke venues close by 10 p.m. at the end of August for areas outside central Tokyo and in mid-September for the city’s central 23 wards.Tokyo Gov. Yuriko Koike is scheduled to hold a press conference at 5 p.m. in which she is expected to disclose new measures to deal with …