Flask-rebar

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- Unbreak with werkzeug 2.1 (268) [Rick Riensche]

* Remove deprecated safe_str_cmp and remove werkzeug pin

* Update black

* Update CI test coverage for Flask+werkzeug 2.1

-------------------
- Pin werkzeug to avoid breaking change (266) [Rick Riensche]
- Don't block CI based on old versions of Flask/werkzeug or EOL Python versions
- Use unittest.mock instead of mock. [Rick Riensche]
- Update pytest for pytest-order support. [Rick Riensche]
- Add pytest-order to dev extras. [Rick Riensche]
- Only use EnumConverter if marshmallow-enum present. [Rick Riensche]
- Add marshmallow-enum convertor to flask-rebar. [Daniel Wallace]

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Fix
~~~

- Fix filter_dump_only for NoneType nested fields (262) [mbierma]

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

Fix
~~~

Add Python 3.10 support:

- Use Mapping from abstract classes (259) [Daniel Wallace]

* Mapping was removed from collections in 3.10 and is only available in collections.abc now.

* update pytest for py3.10 support

* add py3.10 to pr workflow

* use setupactions v2

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

Fix
~~~

- Bumpversion bumped mock :( [Rick Riensche]

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

Fix
~~~
- Remove now-pointless (and worse, broken) DisallowExtraFieldsMixin
(253) [Rick Riensche]
- Handle dump_only fields properly (251) [Rick Riensche]