Fix _PyTime_MIN/MAX values (GH-15384) (GH-15426)

_PyTime_t type is defined as int64_t, and so min/max are INT64_MIN/INT64_MAX,
not PY_LLONG_MIN/PY_LLONG_MAX.

(cherry picked from commit 8e76c456226438f2e4931ce7baf05ac8faae34a1)
1 file changed