Update python-bleach to 2.1.3
- Attributes that have URI values weren't properly sanitized if the values contained character entities. Using character entities, it was possible to construct a URI value with a scheme that was not allowed that would slide through unsanitized.
- Fixed some other edge cases for attribute URI value sanitizing and improved testing of this code.
Test Plan: Tested with spyder and spyder3.
Reviewers: Triage Team, DataDrake
Reviewed By: Triage Team, DataDrake
Differential Revision: https://dev.solus-project.com/D2448