Python 3.10 support

[JWKennington]

The latest versions of flask-bcrypt don't support python 3.10, though many of the flask extensions we use have. This causes a problem since the 0.7.1 release of flask-bcrypt isn't updated for the latest version of werkzeug, which causes the following import error on python 3.10 environments

File "..env/lib/python3.9/site-packages/flask_bcrypt.py", line 21, in <module>
    from werkzeug.security import safe_str_cmp
ImportError: cannot import name 'safe_str_cmp' from 'werkzeug.security'

[robertlayton]

I just ran into the same issue, but was using version 0.7. Upgrading to 1.0.1 solved for me, and that line is not in the current version of the file anymore.

[bliepp]

Issues with werkzeug > 2.2 (sometimes even with > 2.1) are common with many flask addons like flask-login and flask-restx. According to #86 this has already been fixed with 1.0.0. If that is not an option you might consider downgrading to werkzeug to a minor version < 2.1 (and therefore to a minor version of flask < 2.1 as well). Btw I don't get what this is issue has to do with python 3.10.