Bump django-cms from 3.7.1 to 3.7.4 in /storefront

[dependabot]

Bumps django-cms from 3.7.1 to 3.7.4.

Changelog

Sourced from django-cms's changelog.

3.7.4 (2020-07-21)

• Fixed a security vulnerability in the plugin_type url parameter to insert JavaScript code.

3.7.3 (2020-05-27)

• Fixed apphooks config select in Firefox
• Fixed compatibility errors on python 2
• Fixed long page titles in Page tree/list view to prevent horizontal scrolling
• Adapted plugin documentations

3.7.2 (2020-04-22)

• Added support for Django 3.0
• Added support for Python 3.8
• migrated from django.utils.six to the six package
• migrated from django.utils.lru_cache to functools.lru_cache
• migrated from render_to_response to render in cms.views
• added cms.utils.compat.dj.available_attrs
• added --force-color and --skip-checks in base commands when using Django 3
• replaced staticfiles and admin_static with static
• replaced djangocms-helper with django-app-helper
• Added ability to set placeholder global limit on children only

Commits

• 01f53e4 Release 3.7.4 (#6881)
• 764acb3 Release 3.7.3 (#6862)
• 6947eed set white of first column in jstree to normal (#6856) (#6861)
• 5027a5e Fix 3.7 on python 2 (#6855) (#6860)
• 855e1d8 Move var declaration inside closure to make it available to firefox (#6854) (...
• 6f0a40d Corrected plugin documentations based on Issue #6752 (#6798) (#6858)
• 877c5c2 Release 3.7.2 (#6838)
• 7556b59 Backport changes to 3.7.x (#6837)
• 24a0553 Update 04-plugins.rst (#6782)
• See full diff in compare view

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