[3.12] pythongh-120831: Correct default minimum iOS version. (pythonGH-122339) (python#122341)

pythongh-120831: Correct default minimum iOS version. (pythonGH-122339)

Correct default minimum iOS version.
(cherry picked from commit 4a2607c)

Co-authored-by: Russell Keith-Magee <russell@keith-magee.com>

Author: miss-islington

Lib/sysconfig.py

@@ -817,7 +817,7 @@ def get_platform():
             release = m.group()
     elif osname[:6] == "darwin":
         if sys.platform == "ios":
-            release = get_config_vars().get("IPHONEOS_DEPLOYMENT_TARGET", "12.0")
+            release = get_config_vars().get("IPHONEOS_DEPLOYMENT_TARGET", "13.0")
             osname = sys.platform
             machine = sys.implementation._multiarch
         else: