fix: remove edx/revenue-squad from codeowners file

[christopappas]

⛔️ MAIN BRANCH WARNING! 2U EMPLOYEES must make branches against the 2u/main BRANCH

• I have checked the branch to which I would like to merge.

⛔️ DEPRECATION WARNING

This repository is deprecated and in maintainence-only operation while we work on a replacement, please see this announcement for more information.

Although we have stopped integrating new contributions, we always appreciate security disclosures and patches sent to [email protected]

Anyone internally merging to this repository is expected to release and monitor their changes; if you are not able to do this DO NOT MERGE, please coordinate with someone who can to ensure that the changes are released.

Required Testing

• Before deploying this change, complete a purchase in the stage environment.
  (^ We can remove that manual check once REV-2624 is done and the corresponding e2e test runs again)

Description

Describe what this pull request changes, and why these changes were made. How will these changes affect other people, installations of edx, etc.?
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linked here.

Useful information to include:

• Which edX user roles will this change impact? Common user roles are "Learner", "Course Author", "Developer", and "Operator".
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Testing instructions

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Other information

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• Does this change depend on other changes elsewhere?
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