correct PHONY target in Makefile (#5434)
COPYBARA_INTEGRATE_REVIEW=https://github.com/overleaf/overleaf/pull/967 from CNOCycle:CNOCycle-patch-1 d5278c9b7188ebd94cd0a7b0316af5514ae6f22f
Co-authored-by: CNOCycle <github@marginalman.org>
GitOrigin-RevId: 8aa48e4f617c2fdd689442fb959c9a856fc3b859