minor #35606 [Security] Replace 403 with 401 in `onAuthenticationFail…

…ure` method (alanpoulain)

This PR was merged into the 3.4 branch.

Discussion
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[Security] Replace 403 with 401 in `onAuthenticationFailure` method

| Q             | A
| ------------- | ---
| Branch?       | 3.4
| Bug fix?      | no
| New feature?  | no
| Deprecations? | no
| Tickets       | N/A
| License       | MIT
| Doc PR        | N/A

This comment in `onAuthenticationFailure` was misleading since a 401 status code should probably be returned instead of a 403.

Commits
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73bc793 Replace 403 with 401 in onAuthenticationFailure method

src/Symfony/Component/Security/Guard/GuardAuthenticatorInterface.php

@@ -107,7 +107,7 @@ public function createAuthenticatedToken(UserInterface $user, $providerKey);
      * Called when authentication executed, but failed (e.g. wrong username password).
      *
      * This should return the Response sent back to the user, like a
-     * RedirectResponse to the login page or a 403 response.
+     * RedirectResponse to the login page or a 401 response.
      *
      * If you return null, the request will continue, but the user will
      * not be authenticated. This is probably not what you want to do.