refactor(codespaces): switch to more precise `pkill` mechanism
refactor(codespaces): switch to more precise `pkill` mechanism

Of course, this, too, isn't 100% future-proof, because the file may be
renamed or moved in the future, but it seems better than what I had
before (see parent commit).

wincent/wincent,wincent/wincent,wincent/wincent,wincent/wincent,wincent/wincent,wincent/wincent,wincent/wincent,wincent/wincent