Request android.permission.REQUEST_INSTALL_PACKAGES permission

This will allow users to access `Android/obb` on android 11 after explicitly granting Termux the permission by going to Termux `App Info` in Android `Settings` -> `Advance` -> `Install unknown apps`.

https://medium.com/androiddevelopers/android-11-storage-faq-78cefea52b7c

Author: agnostic-apollo

app/src/main/AndroidManifest.xml

@@ -25,6 +25,7 @@
     <uses-permission android:name="android.permission.READ_LOGS" />
     <uses-permission android:name="android.permission.DUMP" />
     <uses-permission android:name="android.permission.WRITE_SECURE_SETTINGS" />
+    <uses-permission android:name="android.permission.REQUEST_INSTALL_PACKAGES" />
 
     <application
         android:extractNativeLibs="true"