[BC Break] Fixes invalid code challenge method payload key name

I guess this change might be a BC break for existing and active authorization tokens when they're validated by the server. The good thing is that an authorization token has a very short expiration time and is used once to request an access token.

src/Grant/AuthCodeGrant.php

@@ -319,7 +319,7 @@ class AuthCodeGrant extends AbstractAuthorizeGrant
                 'user_id'               => $authCode->getUserIdentifier(),
                 'expire_time'           => (new \DateTime())->add($this->authCodeTTL)->format('U'),
                 'code_challenge'        => $authorizationRequest->getCodeChallenge(),
-                'code_challenge_method  ' => $authorizationRequest->getCodeChallengeMethod(),
+                'code_challenge_method' => $authorizationRequest->getCodeChallengeMethod(),
             ];
 
             $response = new RedirectResponse();