chore: upgrade enterprise-integrated-chanels to 0.1.48

[macdiesel]

Description

Describe what this pull request changes, and why. Include implications for people using this change.
Design decisions and their rationales should be documented in the repo (docstring / ADR), per
OEP-19, and can be
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[Copilot]

Pull request overview

Updates the pinned enterprise-integrated-channels dependency version across the generated edx-platform requirements sets to pick up the latest patch release.

Changes:

• Bump enterprise-integrated-channels from 0.1.47 to 0.1.48 in base.txt.
• Propagate the same pin update to the derived generated requirements (doc.txt, testing.txt, development.txt).

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 primary resolved pin for enterprise-integrated-channels to 0.1.48.
requirements/edx/doc.txt	Keeps documentation requirements in sync with the updated base pin.
requirements/edx/testing.txt	Keeps testing requirements in sync with the updated base pin.
requirements/edx/development.txt	Keeps development requirements in sync with the updated doc/testing pins.

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