minor #16381 Remove duplicate line (babache)

This PR was merged into the 5.4 branch.

Discussion
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Remove duplicate line

Remove line 325 :
use Symfony\Component\Security\Http\Authenticator\Passport\Passport;
Same 324

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Commits
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0c7a542 Remove duplicate line

Author: javiereguiluz

security/custom_authenticator.rst

@@ -322,7 +322,6 @@ would initialize the passport like this::
     use Symfony\Component\Security\Http\Authenticator\Passport\Badge\CsrfTokenBadge;
     use Symfony\Component\Security\Http\Authenticator\Passport\Badge\UserBadge;
     use Symfony\Component\Security\Http\Authenticator\Passport\Passport;
-    use Symfony\Component\Security\Http\Authenticator\Passport\Passport;
 
     class LoginAuthenticator extends AbstractAuthenticator
     {