Update edx-enterprise package to version 0.56.1

https://github.com/edx/edx-enterprise/compare/0.56.0...0.56.1

Entitlement API Changes to support User Revoke and Refund

Create custom Text Me The App landing page.

Merge pull request #16900 from edx/tasawer/learner-3165-fix-retries-logic-in-award-program-certificate

Fix retries logic in award program certificate task

ENT-798 Update SailThru user with enterprise name on EnterpriseCustomerUser creation.

Order program instructors based on new program field

PLAT-1840 Fix common/lib tests under Django 1.9

Log payload on 503 errors

Reenabling Entitlement Jasmine tests.

This collects the instructors from the courses in the program like before. There is now a field in the program model in discovery that allows you to list instructors for the program.

Depends on this PR: https://github.com/edx/course-discovery/pull/1244

Skip safe_lxml/etree.py in future isorts

Bump SFE to 0.6.3

Update edx-enterprise package to version 0.56.0.

[LEARNER-2668]

These changes will support a user intiated Revoke and Refund of
an Entitlement. This includes unenrolling the User from
any related Course Runs they are currently enrolled in.

LEARNER-3483

EDUCATOR-1956

Remove dependency on Popper.js

TE-2350 paver function to fingerprint bokchoy db files

https://github.com/edx/edx-enterprise/compare/0.55.5...0.56.0

LEARNER-3165

Add block completion value as optional field in course_blocks.api.

ENT-807: Utilize configured user for SuccessFactors BizX OData API callbacks

Educator-1879 Symmath fails to initialize because of requests library

Changes to fix various Django 1.11 errors

Added extended profile fields to the Account settings page.

Rebrand the branch.io text me the app landing page to reflect edX's style.

LEARNER-2730

Merge pull request #16874 from edx/ahsan/LEARNER-3546-White-listed-certificates-not-appear-on-progress-page

Show white listed certificates on progress page

White listed certificates should appear on the progress page
even if the user has not passed the course
LEARNER-3546

Mergeback PR from private to public.

ENT-800 Fix IE11 Broken Submit button on Registration Page

The imports were sorted in May, which broke the monkeypatching in
safe_lxml.  I added two tests that the XML parsers are properly patched,
but they didn't pass until I added the monkeypatching to the start of
the test runs.  Once that was done, some tests failed because they
relied on specific details of how empty elements are represented.  Those
tests are now fixed.