Change LOVE and SDL branches to main and release-2.0.16 respectively.

Makefile

@@ -10,8 +10,8 @@ ARCH := $(shell uname -m)
 CMAKE_URL := https://github.com/Kitware/CMake/releases/download/v3.20.2/cmake-3.20.2-linux-$(shell uname -m).sh
 
 # Project branches (for git-based projects)
-LOVE_BRANCH := master
-SDL2_BRANCH := release-2.0.14
+LOVE_BRANCH := main
+SDL2_BRANCH := release-2.0.16
 LUAJIT_BRANCH := v2.1
 OPENAL_BRANCH := 1.21.1
 BROTLI_BRANCH := v1.0.9