chore(bb-auth-cognito): release auth.admin as patch, not minor

Reserve minor bumps for real API changes during preview; the
const O breaking-change condition is unlikely to hit in practice
(only literal-variable call sites, 2 found repo-wide).

Author: harsh62

.changeset/auth-cognito-admin-handle.md

@@ -1,5 +1,5 @@
 ---
-"@aws-blocks/bb-auth-cognito": minor
+"@aws-blocks/bb-auth-cognito": patch
 ---
 
 Add an opt-in `auth.admin` handle to `AuthCognito` for server-side group-membership and user-lifecycle administration.