gh-151126: Add PyErr_NoMemory() in strong_cache_node_new

Author: sobolevn

Misc/NEWS.d/next/Core_and_Builtins/2026-06-09-10-28-30.gh-issue-151126.DKa6Sl.rst

@@ -1,3 +1,6 @@
 Fix a crash, when there's no memory left on a device,
-which happened in code compilation.
-Now it raises a proper :exc:`MemoryError`.
+which happened in:
+- Code compilation
+- :mod:`zoneinfo` caching
+
+Now these places raise a proper :exc:`MemoryError`.

Modules/_zoneinfo.c

@@ -2353,6 +2353,7 @@ strong_cache_node_new(PyObject *key, PyObject *zone)
 {
     StrongCacheNode *node = PyMem_Malloc(sizeof(StrongCacheNode));
     if (node == NULL) {
+        PyErr_NoMemory();
         return NULL;
     }