By Charlie Conchie Hopes are growing that the City’s listings drought could soon be quenched as a wave of top firms draw up plans to debut on the London Stock Exchange in the coming months. Talk of a revival in the Square Mile was amplified today after computer-maker Raspberry Pi set out its plans for a £157m float next week and reports emerged that the Chinese-founded fast-fashion giant Shein was set to file an IPO prospectus with the Financial Conduct Authority. Raspberry Pi’s listing next week is expected to fetch the company a price tag of about £500m and could be a boon to the London Stoc…