py-cbor2: updated to 5.6.0

5.6.0

- Added the ``cbor2`` command line tool (for ``pipx run cbor2``)
- Added support for native date encoding (bschoenmaeckers)
- Made the C extension mandatory when the environment variable ``CBOR2_BUILD_C_EXTENSION`` is set
  to ``1``.
- Fixed ``SystemError`` in the C extension when decoding a ``Fractional`` with a bad
  number of arguments or a non-tuple value
- Fixed ``SystemError`` in the C extension when the decoder object hook raises an
  exception
- Fixed a segmentation fault when decoding invalid unicode data
- Fixed infinite recursion when trying to hash a CBOR tag whose value points to the tag
  itself
- Fixed ``MemoryError`` when maliciously constructed bytestrings or string (declared to be absurdly
  large) are being decoded
- Fixed ``UnicodeDecodeError`` from failed parsing of a UTF-8 text string not being wrapped as
  ``CBORDecodeValueError``
- Fixed ``TypeError`` or ``ZeroDivisionError`` from a failed decoding of ``Fraction`` not being
  wrapped as ``CBORDecodeValueError``
- Fixed ``TypeError`` or ``ValueError`` from a failed decoding of ``UUID`` not being wrapped as
  ``CBORDecodeValueError``
- Fixed ``TypeError`` from a failed decoding of ``MIMEMessage`` not being wrapped as
  ``CBORDecodeValueError``
- Fixed ``OverflowError``, ``OSError`` or ``ValueError`` from a failed decoding of epoch-based
  ``datetime`` not being wrapped as ``CBORDecodeValueError``

(adam)