fix: jwt extended broken by flask bump

[dpgaspar]

SUMMARY

Flask 2.3.0 removed app.json_encoder

https://github.com/pallets/flask/blob/255c8d66af6daff3eaa063ea0819e185d4d1e214/CHANGES.rst#version-230

This property was being used by flask-jwt-extended, fixed here: vimalloc/flask-jwt-extended#493
and released on version 4.4.4

This fixes /api/v1/security/login on Superset

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

TESTING INSTRUCTIONS

ADDITIONAL INFORMATION

• Has associated issue:
• Required feature flags:
• Changes UI
• Includes DB Migration (follow approval process in SIP-59)
  • Migration is atomic, supports rollback & is backwards-compatible
  • Confirm DB migration upgrade and downgrade tested
  • Runtime estimates and downtime expectations provided
• Introduces new feature or API
• Removes existing feature or API

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 83.38%. Comparing base (76d897e) to head (3202bcc).
Report is 1094 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff             @@
##           master   #28451       +/-   ##
===========================================
+ Coverage   60.48%   83.38%   +22.89%     
===========================================
  Files        1931      521     -1410     
  Lines       76236    37400    -38836     
  Branches     8568        0     -8568     
===========================================
- Hits        46114    31185    -14929     
+ Misses      28017     6215    -21802     
+ Partials     2105        0     -2105     

Flag	Coverage Δ
hive	49.05% <ø> (-0.12%)	⬇️
javascript	?
mysql	77.09% <ø> (?)
postgres	77.20% <ø> (?)
presto	53.61% <ø> (-0.19%)	⬇️
python	83.38% <ø> (+19.89%)	⬆️
sqlite	76.65% <ø> (?)
unit	58.78% <ø> (+1.15%)	⬆️

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