2021-09-06-update-oauth2-server-dependency.md

title	issue
Update league/oauth2-server dependency	NEXT-16841

Core

• Changed version of league/oauth2-server to at least 8.3.2.
• Changed \Shopware\Core\Framework\Api\OAuth\ClientRepository::getClientEntity() to return null, which will result in the oAuth library raising an OAuthServerException::invalidClient() exception, instead of raising an OAuthServerException::invalidCredentials() manually.