fix: upgrade Select2 to4.0.13

[n1k9]

Description

Change Select2 version to fix securty issue #1949

ADDITIONAL INFORMATION

• Has associated issue:
• Is CRUD MVC related.
• Is Auth, RBAC security related.
• Changes the security db schema.
• Introduces new feature
• Removes existing feature

[dpgaspar]

Thank you!

[codecov]

Codecov Report

Merging #1968 (98a52b0) into master (a6fd86a) will increase coverage by 1.58%.
The diff coverage is 88.57%.

@@            Coverage Diff             @@
##           master    #1968      +/-   ##
==========================================
+ Coverage   70.79%   72.38%   +1.58%     
==========================================
  Files          62       71       +9     
  Lines        7163     8466    +1303     
==========================================
+ Hits         5071     6128    +1057     
- Misses       2092     2338     +246     

Flag	Coverage Δ
python	72.38% <88.57%> (+1.58%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
flask_appbuilder/views.py	63.85% <ø> (ø)
flask_appbuilder/security/manager.py	74.40% <50.00%> (-0.06%)	⬇️
flask_appbuilder/security/utils.py	66.66% <66.66%> (ø)
flask_appbuilder/security/views.py	62.46% <77.77%> (+0.41%)	⬆️
flask_appbuilder/models/sqla/interface.py	81.86% <93.75%> (+3.39%)	⬆️
flask_appbuilder/security/sqla/manager.py	75.18% <94.44%> (+0.85%)	⬆️
flask_appbuilder/__init__.py	100.00% <100.00%> (ø)
flask_appbuilder/api/__init__.py	96.38% <100.00%> (+0.01%)	⬆️
flask_appbuilder/filters.py	89.79% <0.00%> (ø)
... and 10 more

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