Update font styles in Alert components

The commit includes changes in several font styles in the Alert components. This involves changing the font weight from 'font-semibold' to 'font-bold' and adding 'font-normal' in 'alert.tsx'. Additionally, 'font-medium' has been removed from 'auth-error-alert.tsx'.

packages/features/auth/src/components/auth-error-alert.tsx

@@ -31,10 +31,7 @@ export function AuthErrorAlert({
         <Trans i18nKey={`auth:errorAlertHeading`} />
       </AlertTitle>
 
-      <AlertDescription
-        className={'text-sm font-medium'}
-        data-test={'auth-error-message'}
-      >
+      <AlertDescription data-test={'auth-error-message'}>
         <Trans
           i18nKey={`auth:errors.${errorCode}`}
           defaults={'<DefaultError />'}