gen_stub: Fix generation for @generate-legacy-arginfo 70000

> Uncaught Error: Cannot indirectly modify readonly property ClassInfo::$constInfos in gen_stub.php:4158

Author: TimWolla

build/gen_stub.php

@@ -1280,8 +1280,8 @@ class FuncInfo {
     private bool $supportsCompileTimeEval;
     public readonly bool $verify;
     /** @var ArgInfo[] */
-    public readonly array $args;
-    public readonly ReturnInfo $return;
+    public /* readonly */ array $args;
+    public /* readonly */ ReturnInfo $return;
     private readonly int $numRequiredArgs;
     public readonly ?string $cond;
     public bool $isUndocumentable;
@@ -3371,9 +3371,9 @@ class ClassInfo {
     /** @var Name[] */
     private readonly array $implements;
     /** @var ConstInfo[] */
-    public readonly array $constInfos;
+    public /* readonly */ array $constInfos;
     /** @var PropertyInfo[] */
-    private readonly array $propertyInfos;
+    private /* readonly */ array $propertyInfos;
     /** @var FuncInfo[] */
     public array $funcInfos;
     /** @var EnumCaseInfo[] */

ext/zend_test/test.stub.php

@@ -3,7 +3,7 @@
 /**
  * @generate-class-entries static
  * @generate-c-enums
- * @generate-legacy-arginfo 80000
+ * @generate-legacy-arginfo 70000
  * @undocumentable
  */
 namespace {