ext/phar: Adjust return types for methods that always return true

Author: Girgias

ext/phar/phar_object.stub.php

@@ -187,10 +187,10 @@ public function offsetSet($localName, $value): void {}
     public function offsetUnset($localName): void {}
 
     /** @tentative-return-type */
-    public function setAlias(string $alias): bool {}
+    public function setAlias(string $alias): true {}
 
     /** @tentative-return-type */
-    public function setDefaultStub(?string $index = null, ?string $webIndex = null): bool {}
+    public function setDefaultStub(?string $index = null, ?string $webIndex = null): true {}
 
     /** @tentative-return-type */
     public function setMetadata(mixed $metadata): void {}