fix: wrap markdown_styles list in CSSSanitizer for bleach.clean() (#14479)

The css_sanitizer parameter expects a CSSSanitizer instance, not a plain list.

Co-authored-by: Matt Tesauro <mtesauro@gmail.com>

Author: valentijnscholten

dojo/templatetags/display_tags.py

@@ -91,7 +91,7 @@ def markdown_render(value):
                                                       "markdown.extensions.fenced_code",
                                                       "markdown.extensions.toc",
                                                       "markdown.extensions.tables"])
-        return mark_safe(bleach.clean(markdown_text, tags=markdown_tags, attributes=markdown_attrs, css_sanitizer=markdown_styles))
+        return mark_safe(bleach.clean(markdown_text, tags=markdown_tags, attributes=markdown_attrs, css_sanitizer=CSSSanitizer(allowed_css_properties=markdown_styles)))
     return None