[pyexpat] Billion laughs mitigation methods backported to 3.13 and 3.14 (#15900)

Author: srittau

stdlib/pyexpat/__init__.pyi

@@ -33,7 +33,8 @@ class XMLParserType:
     # Added in Python 3.10.20, 3.11.15, 3.12.3, 3.13.10, 3.14.1
     def SetAllocTrackerActivationThreshold(self, threshold: int, /) -> None: ...
     def SetAllocTrackerMaximumAmplification(self, max_factor: float, /) -> None: ...
-    if sys.version_info >= (3, 15):
+    if sys.version_info >= (3, 13):
+        # Added in Python 3.13.4, 3.14.6
         def SetBillionLaughsAttackProtectionActivationThreshold(self, threshold: int, /) -> None: ...
         def SetBillionLaughsAttackProtectionMaximumAmplification(self, max_factor: float, /) -> None: ...