Update minimum supported targetSdk to 29

Trailing by 4 major releases, as per schedule.

Test: make
Test: atest CtsWindowManagerSdk25TestCases:AspectRatioSdk25Tests
Test: atest CtsWindowManagerSdk28TestCases:AspectRatioSdk28Tests

Bug: 215522897
Change-Id: Ie4a4ad6d4e7af8c23003a653a2d2ef514adb1169
diff --git a/core/version_util.mk b/core/version_util.mk
index cbfef96..1c8574c 100644
--- a/core/version_util.mk
+++ b/core/version_util.mk
@@ -251,6 +251,6 @@
   # Used to set minimum supported target sdk version. Apps targeting sdk
   # version lower than the set value will result in a warning being shown
   # when any activity from the app is started.
-  PLATFORM_MIN_SUPPORTED_TARGET_SDK_VERSION := 23
+  PLATFORM_MIN_SUPPORTED_TARGET_SDK_VERSION := 29
 endif
 .KATI_READONLY := PLATFORM_MIN_SUPPORTED_TARGET_SDK_VERSION