Add PhpParser to composer-require-checker configuration

Note: PhpParser is only used in deprecated-src.

This change updates the configuration file by adding "PhpParser" to the list of globally recognized symbols. This ensures that the composer-require-checker tool accounts for "PhpParser" when verifying dependencies, preventing false positives in projects using this symbol.

composer-require-checker.json

@@ -3,6 +3,7 @@
     "null", "true", "false",
     "static", "self", "parent",
     "array", "string", "int", "float", "bool", "iterable", "callable", "void", "object",
-    "Attribute", "ReflectionAttribute"
+    "Attribute", "ReflectionAttribute",
+    "PhpParser"
   ]
 }