Merge pull request cli#13886 from kobihikri/rm-dead-codeowners

chore: remove dead CODEOWNERS rule for non-existent pkg/cmd/release/attestation/

Author: williammartin

.github/CODEOWNERS

@@ -5,7 +5,6 @@ internal/codespaces/ @cli/codespaces @cli/code-reviewers
 
 # Limit Package Security team ownership to the attestation command package and related integration tests
 pkg/cmd/attestation/ @cli/package-security @cli/code-reviewers
-pkg/cmd/release/attestation/ @cli/package-security @cli/code-reviewers
 pkg/cmd/release/verify/ @cli/package-security @cli/code-reviewers
 pkg/cmd/release/verify-asset/ @cli/package-security @cli/code-reviewers
 pkg/cmd/release/shared/ @cli/package-security @cli/code-reviewers