[1.x] Skip writing to a closed stream test on PHP8.5

While I couldn't pin it to the exact commit/PR/NEWS/UPGRADING item, PHP8.5 has seen a number of improvements to streams to make them less buggy. As a result, this test, which already confirmed the expected behavior is now failing because an error is tossed.

Author: WyriHaximus

tests/WritableResourceStreamTest.php

@@ -474,6 +474,10 @@ public function testDoubleCloseWillEmitOnlyOnce()
      */
     public function testWritingToClosedWritableResourceStreamShouldNotWriteToStream()
     {
+        if (PHP_VERSION_ID >= 80500) {
+            $this->markTestSkipped('Since PHP8.5 attempting to write to a closed stream will result in an error');
+        }
+
         $stream = fopen('php://temp', 'r+');
         $filterBuffer = '';
         $loop = $this->createLoopMock();