Fix deprecation of Bundle.getSerializable(String) by using BundleCompat

This fixes the following warning during compilation:

file:app/src/main/java/org/schabi/newpipe/about/LicenseFragment.kt:36:55 'fun getSerializable(p0: String?): Serializable?' is deprecated. Deprecated in Java.

Author: TobiGr

app/src/main/java/org/schabi/newpipe/about/LicenseFragment.kt

@@ -7,6 +7,7 @@ import android.view.View
 import android.view.ViewGroup
 import android.webkit.WebView
 import androidx.appcompat.app.AlertDialog
+import androidx.core.os.BundleCompat
 import androidx.core.os.bundleOf
 import androidx.fragment.app.Fragment
 import io.reactivex.rxjava3.android.schedulers.AndroidSchedulers
@@ -33,7 +34,9 @@ class LicenseFragment : Fragment() {
         super.onCreate(savedInstanceState)
         softwareComponents = arguments?.parcelableArrayList<SoftwareComponent>(ARG_COMPONENTS)!!
             .sortedBy { it.name } // Sort components by name
-        activeSoftwareComponent = savedInstanceState?.getSerializable(SOFTWARE_COMPONENT_KEY) as? SoftwareComponent
+        activeSoftwareComponent = savedInstanceState?.let {
+            BundleCompat.getSerializable(it, SOFTWARE_COMPONENT_KEY, SoftwareComponent::class.java)
+        }
     }
 
     override fun onDestroy() {