The cover letter isn’t dead yet, despite what some “experts” might say. While many hiring managers won’t read your cover letter, submitting one may still be part of the application requirements. They’ll check to make sure you included one, and if you didn’t, they may reject you outright.
Additionally, some hiring managers still use cover letters as an important factor in their hiring decisions. To maximize your chances of getting an interview, always include a cover letter with your application.