Fixed: Remove deprecated attribute extractNativeLibs

Fixes the following deprecation warning when builing:

> AndroidManifest.xml:44:9-41 Warning:
> android:extractNativeLibs should not be specified in this source AndroidManifest.xml file. See https://d.android.com/guide/topics/manifest/application-element#extractNativeLibs for more information.
> The AGP Upgrade Assistant can remove the attribute from the AndroidManifest.xml file and update the build file accordingly. See https://d.android.com/studio/build/agp-upgrade-assistant for more information.

The useLegacyPackaging DSL option is already used in `app/build.gradle`.

Author: fornwall

app/src/main/AndroidManifest.xml

@@ -41,7 +41,6 @@
         android:name=".app.TermuxApplication"
         android:allowBackup="false"
         android:banner="@drawable/banner"
-        android:extractNativeLibs="true"
         android:icon="@mipmap/ic_launcher"
         android:label="@string/application_name"
         android:requestLegacyExternalStorage="true"