By Martin Baccardax Stock futures slip as traders close out brutal year for global equities; Southwest slides as flight chaos looks set to clip Q4 earnings; Bahamas regulators hold $3.5 billion in FTX Digital assets; President Biden signs $1.7 trillion spending bill, averting government shutdown and Congressional Democrats to release Trump tax returns after years-long battle to keep them private. Five things you need to know before the market opens on Friday December 30: 1. — Stock Futures Slip As Traders Close Out Brutal Year For Global Equities U.S. equity futures inched lower Friday as glo…