Remove PyPy bugs tests, now that PyPy runs them on their side (GH-4486)
Remove PyPy bugs tests, now that PyPy runs them on their side (GH-4486)

As suggested in https://github.com/cython/cython/pull/4471#issuecomment-979489947
I don't think that we're getting any benefit from running the pypy
known bugs test as part of the CI (and it's causing minor problems).
scoder/cython,da-woods/cython,cython/cython,da-woods/cython,da-woods/cython,scoder/cython,da-woods/cython,scoder/cython,cython/cython,cython/cython,scoder/cython,cython/cython