fix: CSP, bump FAB to 4.3.4

[dpgaspar]

SUMMARY

Bump FAB to 4.3.4 to get CSP fixes and others:

Changelog:

• fix: select filters spacing, theme and operation select [Daniel Vaz Gaspar]
• refactor: Refactored logging functions to consistently use lazy interpolation [Bruce]
• feat: add optional flask-talisman and use csp nonce on scripts [Daniel Vaz Gaspar]
• chore: improve tests and test data load [Daniel Vaz Gaspar]

https://github.com/dpgaspar/Flask-AppBuilder/blob/master/CHANGELOG.rst#improvements-and-bug-fixes-on-434

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

TESTING INSTRUCTIONS

ADDITIONAL INFORMATION

• Has associated issue: OAuth login broken with Content Security Policy #24597, Swagger API page is empty #24616
• 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

[kgabryje]

Tested, looks like OAuth is working now!

[codecov]

Codecov Report

Merging #24646 (e027548) into master (fe2c14f) will increase coverage by 10.74%.
The diff coverage is n/a.

❗ Current head e027548 differs from pull request most recent head 7435d95. Consider uploading reports for the commit 7435d95 to get more accurate results

@@             Coverage Diff             @@
##           master   #24646       +/-   ##
===========================================
+ Coverage   58.33%   69.08%   +10.74%     
===========================================
  Files        1907     1907               
  Lines       74153    74153               
  Branches     8182     8182               
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+ Hits        43255    51225     +7970     
+ Misses      28775    20805     -7970     
  Partials     2123     2123               

Flag	Coverage Δ
hive	54.14% <ø> (ø)
mysql	79.47% <ø> (?)
postgres	79.56% <ø> (?)
presto	54.04% <ø> (ø)
python	83.54% <ø> (+22.41%)	⬆️
sqlite	78.12% <ø> (?)
unit	54.83% <ø> (ø)

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