fix: fix failing test when crypt is missing. In 3.13 crypt is gone and there is no replacement as it's supplied by a .so as _crypt. Don't hardcode the crypt method in the array, add it (next to last) only if crypt was detected.

try:
    # Python 3+
    from ssl import SSLError
except (ImportError, AttributeError):
    # Python 2.5-2.7
    from socket import sslerror as SSLError    # noqa: F401