chore: Bump/relax Flask libs

[john-bodley]

SUMMARY

In #22355 the Flask libraries were bumped, however:

1. Since then, Flask-WTF 1.1.0 has resolved an issue with JSONEncoder*
2. The upper bounds on several of the packages were fairly restrictive—typically the upper bound should be exclusive of the next major version. Note overly restrictive constraints can be problematic when trying to resolve a feasible requirement space, especially for installations which include additional requirements.

* More specifically the error we (Airbnb) are seeing with Flask-WTF is:

.tox/py39/lib/python3.9/site-packages/flask_wtf/recaptcha/widgets.py:6: in <module>
  JSONEncoder = json.JSONEncoder
  E   AttributeError: module 'flask.json' has no attribute 'JSONEncoder'

This PR both bumps and relaxes the Flask libraries (where appropriate) and re-compiles the requirements for CI et al.

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

TESTING INSTRUCTIONS

CI.

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

cc: @EugeneTorap

[codecov]

Codecov Report

Merging #24652 (d32c18a) into master (4881328) will increase coverage by 0.02%.
The diff coverage is n/a.

❗ Current head d32c18a differs from pull request most recent head b8213ec. Consider uploading reports for the commit b8213ec to get more accurate results

@@            Coverage Diff             @@
##           master   #24652      +/-   ##
==========================================
+ Coverage   69.05%   69.07%   +0.02%     
==========================================
  Files        1907     1907              
  Lines       74151    74151              
  Branches     8182     8182              
==========================================
+ Hits        51204    51223      +19     
+ Misses      20824    20805      -19     
  Partials     2123     2123              

Flag	Coverage Δ
hive	54.14% <ø> (ø)
mysql	79.47% <ø> (ø)
postgres	79.56% <ø> (ø)
presto	54.04% <ø> (ø)
python	83.54% <ø> (+0.05%)	⬆️
sqlite	78.12% <ø> (?)
unit	54.83% <ø> (ø)

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[michael-s-molina]

LGTM