Update androidx webkit (aka WebView compat) to 1.13.0 (#6079)

Task/Issue URL:
https://app.asana.com/1/137249556945/project/1210223179359983/task/1208295420929852?focus=true

### Description
Updates the AndroidX WebKit library to a newer, stable release that's
been out for a few months.

### Steps to test this PR
- [ ] General smoke test

---------

Co-authored-by: Craig Russell <[email protected]>

Author: CDRussell

app/src/test/java/com/duckduckgo/app/appearance/AppearanceViewModelTest.kt

@@ -18,6 +18,7 @@ package com.duckduckgo.app.appearance
 
 import android.annotation.SuppressLint
 import androidx.arch.core.executor.testing.InstantTaskExecutorRule
+import androidx.test.ext.junit.runners.AndroidJUnit4
 import app.cash.turbine.test
 import com.duckduckgo.app.appearance.AppearanceViewModel.Command
 import com.duckduckgo.app.browser.omnibar.ChangeOmnibarPositionFeature
@@ -39,12 +40,14 @@ import org.junit.Assert.assertEquals
 import org.junit.Before
 import org.junit.Rule
 import org.junit.Test
+import org.junit.runner.RunWith
 import org.mockito.Mock
 import org.mockito.MockitoAnnotations
 import org.mockito.kotlin.never
 import org.mockito.kotlin.verify
 import org.mockito.kotlin.whenever
 
+@RunWith(AndroidJUnit4::class)
 internal class AppearanceViewModelTest {
     @get:Rule
     @Suppress("unused")

versions.properties

@@ -67,7 +67,7 @@ version.androidx.test.rules=1.6.1
 
 version.androidx.test.runner=1.6.2
 
-version.androidx.webkit=1.11.0
+version.androidx.webkit=1.13.0
 
 version.androidx.work=2.9.1