chore: Update enterprise-integrated-channels to 0.1.51

[macdiesel]

Description

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OEP-19, and can be
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[Copilot]

Pull request overview

This PR updates the pinned enterprise-integrated-channels dependency to 0.1.51 across the generated Open edX requirements sets.

Changes:

• Bump enterprise-integrated-channels from 0.1.50 to 0.1.51 in base requirements.
• Propagate the same bump to the doc, testing, and development requirement lock files.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

File	Description
requirements/edx/base.txt	Updates the resolved/pinned enterprise-integrated-channels version used by the platform baseline.
requirements/edx/development.txt	Keeps development dependency set consistent with updated base/doc/testing pins.
requirements/edx/doc.txt	Updates documentation build dependency set to match the new pin.
requirements/edx/testing.txt	Updates test dependency set to match the new pin.

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