Fix GH-10259 ReflectionClass::getStaticProperties doesn't need null return type

NEWS

@@ -85,6 +85,8 @@ PHP                                                                        NEWS
 - Reflection:
   . Fix GH-9470 (ReflectionMethod constructor should not find private parent
     method). (ilutov)
+  . Fix GH-10259 (ReflectionClass::getStaticProperties doesn't need null return
+    type). (kocsismate)
 
 - Sockets:
   . Added SO_ATTACH_REUSEPORT_CBPF socket option, to give tighter control

UPGRADING

@@ -93,6 +93,9 @@ PHP 8.3 UPGRADE NOTES
     a random seed, 0 will use zero as the seed. The functions are now consistent
     with Mt19937::__construct().
 
+- Reflection:
+  . Return type of ReflectionClass::getStaticProperties() is no longer nullable.
+
 - Sockets:
   . Added socket_atmark to checks if the socket is OOB marked.
 

ext/reflection/php_reflection.stub.php

@@ -404,7 +404,7 @@ public function getParentClass(): ReflectionClass|false {}
     public function isSubclassOf(ReflectionClass|string $class): bool {}
 
     /** @tentative-return-type */
-    public function getStaticProperties(): ?array {}
+    public function getStaticProperties(): array {}
 
     /** @tentative-return-type */
     public function getStaticPropertyValue(string $name, mixed $default = UNKNOWN): mixed {}

ext/reflection/tests/ReflectionClass_toString_001.phpt

@@ -349,7 +349,7 @@ Class [ <internal:Reflection> class ReflectionClass implements Stringable, Refle
 
       - Parameters [0] {
       }
-      - Tentative return [ ?array ]
+      - Tentative return [ array ]
     }
 
     Method [ <internal:Reflection> public method getStaticPropertyValue ] {