Currently vendored `setproctitle` version is 1.3.6
The Cython code that exposes the C library to Python is setproctitle.pxd and setproctitle.pxi

Instructions to upgrade `setproctitle`:

- pip download setproctitle==1.3.6 --no-binary=:all: --no-deps
- tar xzvf setproctitle-1.3.6.tar.gz
- mv setproctitle-1.3.6/src src/ray/thirdparty/setproctitle/
