[skip ci] Skip segfaulting OOM test in GH actions on Win

This only fails on the PHP-8.3 branch, most likely to be related to the
environment as discussed with Niels.

ext/spl/tests/gh14639.phpt

@@ -7,6 +7,9 @@ memory_limit=2M
 if (getenv("USE_ZEND_ALLOC") === "0") {
     die("skip Zend MM disabled");
 }
+if (getenv("GITHUB_ACTIONS") && substr(PHP_OS, 0, 3) == "WIN") {
+    die("skip Segfaults in GitHub actions on Windows");
+}
 ?>
 --FILE--
 <?php