Update CODEOWNERS to remove a user

[nickwalkmsft]

Removed 'nickwalkmsft' from the default owners list.

[learn-build-service-prod]

PoliCheck Scan Report

The following report lists PoliCheck issues in PR files. Before you merge the PR, you must fix all severity-1 and severity-2 issues. The AI Review Details column lists suggestions for either removing or replacing the terms. If you find a false positive result, mention it in a PR comment and include this text: #policheck-false-positive. This feedback helps reduce false positives in future scans.

✅ No issues found

More information about PoliCheck

Information: PoliCheck | Severity Guidance | Term
For any questions: Try searching the learn.microsoft.com contributor guides or post your question in the Learn support channel.

[learn-build-service-prod]

Learn Build status updates of commit f981c7e:

✅ Validation status: passed

File	Status	Preview URL	Details
CODEOWNERS	✅Succeeded

For more details, please refer to the build report.

[nickwalkmsft]

#sign-off

[sgaspari815]

@nickwalkmsft replacing your alias with Kelly's

[learn-build-service-prod]

PoliCheck Scan Report

The following report lists PoliCheck issues in PR files. Before you merge the PR, you must fix all severity-1 and severity-2 issues. The AI Review Details column lists suggestions for either removing or replacing the terms. If you find a false positive result, mention it in a PR comment and include this text: #policheck-false-positive. This feedback helps reduce false positives in future scans.

✅ No issues found

More information about PoliCheck

Information: PoliCheck | Severity Guidance | Term
For any questions: Try searching the learn.microsoft.com contributor guides or post your question in the Learn support channel.

[learn-build-service-prod]

Learn Build status updates of commit 1daba18:

✅ Validation status: passed

File	Status	Preview URL	Details
CODEOWNERS	✅Succeeded

For more details, please refer to the build report.