Revert "bug #57520 [SecurityBundle] Remove unused memory users’ name attribute from the XSD (MatTheCat)"

This reverts commit 28ad602851e591826dcd85120e62821330c4019d, reversing
changes made to f8c5cf02a2813b130db3da839a78ae1f477997bf.

Author: nicolas-grekas

Resources/config/schema/security-1.0.xsd

@@ -113,6 +113,7 @@
 
     <xsd:complexType name="user">
         <xsd:attribute name="identifier" type="xsd:string" />
+        <xsd:attribute name="name" type="xsd:string" />
         <xsd:attribute name="password" type="xsd:string" />
         <xsd:attribute name="roles" type="xsd:string" />
     </xsd:complexType>