Fix json backwards compat hack.

[jwag956]

Allow the _json_encoder hack for Flask 2.2.x rather than just 2.2.2.

SQLAlchemy_utils now supports 2.x so allow that in our tests.

[codecov]

Codecov Report

Base: 98.07% // Head: 98.07% // No change to project coverage 👍

Coverage data is based on head (0aeb545) compared to base (f9b4435).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #757   +/-   ##
=======================================
  Coverage   98.07%   98.07%           
=======================================
  Files          34       34           
  Lines        4472     4472           
=======================================
  Hits         4386     4386           
  Misses         86       86           

Impacted Files	Coverage Δ
flask_security/json.py	100.00% <100.00%> (ø)

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