Update itsdangerous to 2.0.0

[pyup-bot]

This PR updates itsdangerous from 1.1.0 to 2.0.0.

Changelog

2.0.0

-------------

Released 2021-05-11

-   Drop support for Python 2 and 3.5.
-   JWS support (``JSONWebSignatureSerializer``,
 ``TimedJSONWebSignatureSerializer``) is deprecated. Use a dedicated
 JWS/JWT library such as authlib instead. :issue:`129`
-   Importing ``itsdangerous.json`` is deprecated. Import Python's
 ``json`` module instead. :pr:`152`
-   Simplejson is no longer used if it is installed. To use a different
 library, pass it as ``Serializer(serializer=...)``. :issue:`146`
-   ``datetime`` values are timezone-aware with ``timezone.utc``. Code
 using ``TimestampSigner.unsign(return_timestamp=True)`` or
 ``BadTimeSignature.date_signed`` may need to change. :issue:`150`
-   If a signature has an age less than 0, it will raise
 ``SignatureExpired`` rather than appearing valid. This can happen if
 the timestamp offset is changed. :issue:`126`
-   ``BadTimeSignature.date_signed`` is always a ``datetime`` object
 rather than an ``int`` in some cases. :issue:`124`
-   Added support for key rotation. A list of keys can be passed as
 ``secret_key``, oldest to newest. The newest key is used for
 signing, all keys are tried for unsigning. :pr:`141`
-   Removed the default SHA-512 fallback signer from
 ``default_fallback_signers``. :issue:`155`
-   Add type information for static typing tools. :pr:`186`

Links

• PyPI: https://pypi.org/project/itsdangerous
• Changelog: https://pyup.io/changelogs/itsdangerous/
• Homepage: https://palletsprojects.com/p/itsdangerous/

[pyup-bot]

Closing this in favor of #104