By Martin Baccardax Stock futures resume slump on rate hike, recession concerns; Apple shares slide on report of waning iPhone demand; Biogen shares soar after positive results from Alzheimer’s trial; Elon musk seeks to overturn sec rule on Twitter vetting and Hurricane Ian to slam Florida coast as category 4 storm. Here are five things you must know for Wednesday, September 28: 1. — Stock Futures Resume Slump On Rate Hike, Recession ConcernsU.S. equity futures slumped lower again Wednesday, extending their recent slide into a seventh consecutive session decline and the longest in more than t…