Tencent Holdings, the Chinese technology behemoth, is taking a stake in Monzo, the British-based digital bank which has confounded expectations by securing a $4.5bn (£3.3bn) valuation. Sky News has learnt that Tencent, which has become a prolific investor in Europe‘s burgeoning tech sector, has subscribed to shares as part of a $100m (£74m) top-up to Monzo’s latest funding round. A source close to the process said Tencent was investing a minority of the $100m capital injection. The Chinese company’s involvement adds another prominent investor to the bank’s share register, weeks after it confirmed that the likes of Coatue and the…