[CI] Fixes PyPy build

tox.ini

@@ -44,7 +44,7 @@ commands = {toxinidir}/extra/release/removepyc.sh {toxinidir}
 basepython = pypy
 deps = -r{toxinidir}/requirements/default.txt
        -r{toxinidir}/requirements/test.txt
-       -r{toxinidir}/requirements/test-ci-default.txt
+       -r{toxinidir}/requirements/test-ci-base.txt
 setenv = C_DEBUG_TEST = 1
 commands = {toxinidir}/extra/release/removepyc.sh {toxinidir}
            pip install -q -U -r{toxinidir}/requirements/dev.txt