Re-increment reported WM Extensions version

To make sure all the API 2 features are available.

Bug: 261780650
Test: N/A
Merged-In: Ic58e35140219fba3dc9a2cc5a9ec7372c5a0405c
Change-Id: Ic58e35140219fba3dc9a2cc5a9ec7372c5a0405c

libs/WindowManager/Jetpack/src/androidx/window/extensions/WindowExtensionsImpl.java

@@ -41,7 +41,7 @@ public class WindowExtensionsImpl implements WindowExtensions {
     // TODO(b/241126279) Introduce constants to better version functionality
     @Override
     public int getVendorApiLevel() {
-        return 1;
+        return 2;
     }
 
     /**