Bump django-cms from 3.5.2 to 3.5.4

[dependabot]

Bumps django-cms from 3.5.2 to 3.5.4.

Changelog

Sourced from django-cms's changelog.

3.5.4 (2020-07-21)

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

3.5.3 (2018-11-20)

• Fixed TreeNode.DoesNotExist exception raised when exporting and loading database contents via dumpdata and loaddata.
• Fixed a bug where request.current_page would always be the public page, regardless of the toolbar status (draft / live). This only affected custom urls from an apphook.
• Removed extra quotation mark from the sideframe button template
• Fixed a bug where structureboard tried to preload markup when using legacy renderer
• Fixed a bug where updates on other tab are not correctly propagated if the operation was to move a plugin in the top level of same placeholder
• Fixed a bug where xframe options were processed by clickjacking middleware when page was served from cache, rather then get this value from cache
• Fixed a bug where cached page permissions overrides global permissions
• Fixed a bug where plugins that are not rendered in content wouldn't be editable in structure board
• Fixed a bug with expanding static placeholder by clicking on "Expand All" button
• Fixed a bug where descendant pages with a custom url would lose the overwritten url on save.
• Fixed a bug where setting the on_delete option on PlaceholderField and PageField fields would be ignored.
• Fixed a bug when deleting a modal from changelist inside a modal

Commits

• 932da2e Release 3.5.4 (#6879)
• 873876b Fixed a bug with top-level object/embed/applet tags (#6497) (#6646)
• a5ba280 Fix wrong field name (#6467) (#6632)
• 2f017dd Update copyright year in docs to be dynamic (#6618) (#6639)
• 2fb6bc8 Page has no attribute site_id [Docs] (#6614) (#6642)
• abf5862 Fixed #6440 -- render_plugin_block template tag (#6472) (#6644)
• 55e50f7 typo: added spaces on configuration docs (#6330) (#6648)
• 8b72a79 Fixed Travis by moving some jobs to allow_failures (#6653)
• ccfa5ca Fixed djangocms-text-ckeditor version for older Django versions (#6651)
• 44dcd41 Fixed #6457 -- Fixed rendering of permission icons (#6624) (#6626)
• Additional commits viewable in compare view

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