By Claudia Cristoferi and Silvia Aloisi MILAN (Reuters) -Salvatore Ferragamo’s CEO promised a quick turnaround for the Italian luxury group, vowing to increase investments, revamp stores and attract younger customers to double revenues to almost 2.3 billion euros by 2026. Marco Gobbetti, who joined the family-owned group in January from Burberry, forecast a rise in Ferragamo’s sales this year despite problems in China, where retail revenues declined in the first quarter due to new COVID-19 restrictions. Gobbetti said that disruptions in China, which began at the end of March, had worsened in A…