Update sponsors of Symfony 7.0: Shopware, Sulu and Les-Tilleuls + Sensiolabs for Messenger & SymfonyCasts for Security components

Author: nicolas-grekas

README.md

@@ -7,7 +7,7 @@ The Security CSRF (cross-site request forgery) component provides a class
 Sponsor
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-The Security component for Symfony 6.4 is [backed][1] by [SymfonyCasts][2].
+The Security component for Symfony 7.0 is [backed][1] by [SymfonyCasts][2].
 
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