chore: remove @justin-mp from CODEOWNERS (#10762)

Author: parthea

.github/CODEOWNERS

@@ -31,7 +31,7 @@
 /dns/**/*                              @GoogleCloudPlatform/dee-infra @GoogleCloudPlatform/python-samples-reviewers
 /iam/cloud-client/**/*                 @GoogleCloudPlatform/dee-infra @GoogleCloudPlatform/python-samples-reviewers
 /kms/**/**                             @GoogleCloudPlatform/dee-infra @GoogleCloudPlatform/python-samples-reviewers
-/media_cdn/**/*                        @justin-mp @GoogleCloudPlatform/dee-infra @GoogleCloudPlatform/python-samples-reviewers
+/media_cdn/**/*                        @GoogleCloudPlatform/dee-infra @GoogleCloudPlatform/python-samples-reviewers
 /privateca/**/*                        @GoogleCloudPlatform/dee-infra @GoogleCloudPlatform/python-samples-reviewers
 /recaptcha_enterprise/**/*             @GoogleCloudPlatform/dee-infra @GoogleCloudPlatform/python-samples-reviewers
 /recaptcha_enterprise/demosite/**/*    @GoogleCloudPlatform/dee-infra @GoogleCloudPlatform/recaptcha-customer-obsession-reviewers @GoogleCloudPlatform/python-samples-reviewers