chore(deps): update flask-admin requirement from ~=1.5.5 to ~=1.5.6

[dependabot-preview]

Updates the requirements on flask-admin to permit the latest version.

Release notes

Sourced from flask-admin's releases.

v1.5.6

• SQLAlchemy 1.3.6 compatibility fix
• Python 3.8 support

Changelog

Sourced from flask-admin's changelog.

1.5.6

• SQLAlchemy 1.3.6 compatibility fix
• Python 3.8 support

1.5.5

• Werkzeug 1.0 compatibility fix
• Use fa-circle-o icon for unchecked booleans
• A few SQLAlchemy-related bug fixes

1.5.4

• Fix display of inline x-editable boolean fields on list view
• Add support for several SQLAlchemy-Utils data types
• Support searching on SQLAlchemy hybrid properties
• Extra URL paramaters are now propagated to the next page when searching / filtering
• Add enum34 dependency when running on legacy Python version
• Update Mapbox API v1 URL format
• Update jQuery and moment dependencies in templates
• Fixed a datepicker issue, where only dates up to 2015 were showing up
• Updated Pillow dependency version

1.5.3

• Fixed XSS vulnerability
• Support nested categories in the navbar menu

SQLAlchemy
:   -   sort on multiple columns with column_default_sort
-   sort on related models in column_sortable_list
-   show searchable fields in search input's placeholder text
-   fix: inline model forms can now also be used for models with multiple primary keys
-   support for using mapped column_property

• Upgrade Leaflet and Leaflet.draw plugins, used for geoalchemy integration
• Specify minimum_input_length for ajax widget
• Peewee: support composite keys
• MongoEngine: when searching/filtering the input is now regarded as case-insensitive by default

FileAdmin
:   -   handle special characters in filename

... (truncated)

Commits

• 714c42b Merge branch 'master' of github.com:flask-admin/flask-admin
• b29c99a Version bump
• 2b0bdfa Merge pull request #1975 from Abdur-rahmaanJ/patch-1
• 1d5ad50 Fixed SQLAlchemy 1.3.6 compatibility issue
• db87b02 Removed quotes in instructions
• fe0c818 Merge pull request #1967 from ianhhlee/master
• 0906b5e Merge pull request #1964 from cjmayo/py38
• cc9099c Update LICENSE
• 667e782 Drop testing Python 3.4 and add 3.7 and 3.8
• See full diff in compare view

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[codecov]

Codecov Report

Merging #6919 into development will not change coverage by %.
The diff coverage is n/a.

@@             Coverage Diff              @@
##           development    #6919   +/-   ##
============================================
  Coverage        66.40%   66.40%           
============================================
  Files              313      313           
  Lines            15359    15359           
============================================
  Hits             10199    10199           
  Misses            5160     5160           

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