chore(ndk): upgrade to r29.

The purpose is to fix the 16kb alignment. See https://developer.android.com/guide/practices/page-sizes#compile-16-kb-alignment

Author: ThibaultBee

srtdroid-core/build.gradle.kts

@@ -10,7 +10,7 @@ configurePublication()
 android {
     namespace = "io.github.thibaultbee.srtdroid.core"
     compileSdk = AndroidVersions.COMPILE_SDK
-    ndkVersion = "25.2.9519653"
+    ndkVersion = "29.0.13599879"
 
     defaultConfig {
         minSdk = AndroidVersions.MIN_SDK