N°6934 - Symfony 6.4 - upgrade Symfony bundles to 6.4 (#580)

* Update Symfony lib to version ~6.4.0
* Update code missing return type
* Add an iTop general configuration entry to store application secret (Symfony mandatory parameter)
* Use dependency injection in ExceptionListener & UserProvider classes

lib/symfony/web-profiler-bundle/Resources/views/Icon/messenger.svg

@@ -1 +1,8 @@
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+<svg xmlns="http://www.w3.org/2000/svg" data-icon-name="icon-tabler-subtask" width="24" height="24" viewBox="0 0 24 24" stroke-width="1.5" stroke="currentColor" fill="none" stroke-linecap="round" stroke-linejoin="round">
+    <path stroke="none" d="M0 0h24v24H0z" fill="none"></path>
+    <line x1="6" y1="9" x2="12" y2="9"></line>
+    <line x1="4" y1="5" x2="8" y2="5"></line>
+    <path d="M6 5v11a1 1 0 0 0 1 1h5"></path>
+    <rect x="12" y="7" width="8" height="4" rx="1"></rect>
+    <rect x="12" y="15" width="8" height="4" rx="1"></rect>
+</svg>