Remove the trailing slash from libsdl-org/SDL submodule URL
Remove the trailing slash from libsdl-org/SDL submodule URL

Rust-SDL2/rust-sdl2,Rust-SDL2/rust-sdl2,Cobrand/rust-sdl2,Cobrand/rust-sdl2,Cobrand/rust-sdl2,Rust-SDL2/rust-sdl2