[Security] Keep SymfonyCasts as backers of the Security components 🤗

Author: nicolas-grekas

README.md

@@ -41,7 +41,7 @@ if (!$accessDecisionManager->decide($token, ['ROLE_ADMIN'])) {
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-The Security component for Symfony 7.1 is [backed][1] by [SymfonyCasts][2].
+The Security component for Symfony 7.4 is [backed][1] by [SymfonyCasts][2].
 
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