Update problem-builder xblock install version (PLAT-1644)

[ny0m]

Quick PR to update edx-private requirements to include the latest version of problem-builder.

Dependencies: None

Merge deadline: None

Testing instructions:

From repo root:

1. pip install -r requirements/edx/edx-private.txt
2. See no errors

Reviewers

• @pomegranited

[openedx-webhooks]

Thanks for the pull request, @bradmerlin! I've created OSPR-1854 to keep track of it in JIRA. JIRA is a place for product owners to prioritize feature reviews by the engineering development teams.

Feel free to add as much of the following information to the ticket:

• supporting documentation
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[bradenmacdonald]

@bmedx can you please help us review/merge this if the build is green?

[pomegranited]

👍 @bradmerlin

• I tested this on my devstack using the PR instructions.
• I read through the code
• I checked for accessibility issues
• Includes documentation - just a version bump

[bradenmacdonald]

@bmedx @edx/devops Argh, I think we'll need to revert this ASAP. I just realized that this version bump goes from 2.6.5 -> 2.6.10, which includes some hefty migrations that need to be handled very carefully, which have been stalled for months - see https://github.com/edx/edx-platform/pull/14327 and the original TNL-5932 ticket.

I opened #15783 to revert this if that is the case.

[edx-pipeline-bot]

EdX Release Notice: This PR has been deployed to the staging environment in preparation for a release to production on Thursday, August 10, 2017.

[edx-pipeline-bot]

EdX Release Notice: This PR has been deployed to the production environment.