Use modern Android libc++ in Yoga and React Native OSS (#39795)

Summary:
Pull Request resolved: facebook/react-native#39795
X-link: facebook/yoga#1412

Android NDK 25 uses a version of libc++ that is more than three years old, missing a lot of basic features of C++ 20. This is rectified in NDK 26 (latest LTS NDK), which brings us up to date with latest Clang (17, released this year), and adds a new policy where future NDK versions will bump libc++ as part of bumping LLVM/Clang.

This requires an a beta AGP version (and corresponding Android Studio Preview). Based on how far we are historically, it wouldn't be a surprise if we see the stable release this month (well before the RN 0.74/Yoga 3.0 cut, even in the worse case).

Changelog:
[Android][Changed] - Use NDK 26

Reviewed By: yungsters

Differential Revision: D49895949

fbshipit-source-id: 37bb4d1fdf81137be7f14f6675b4e079c6f861e4

Original-Commit: facebook/react-native@9ce7b56

template/android/build.gradle

@@ -6,7 +6,7 @@ buildscript {
         minSdkVersion = 23
         compileSdkVersion = 34
         targetSdkVersion = 34
-        ndkVersion = "25.1.8937393"
+        ndkVersion = "26.0.10792818"
         kotlinVersion = "1.8.0"
     }
     repositories {