Fix part of oppia#5195: RestrictedApi. Using a private API (oppia#5198)

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## Explanation
Fix part of oppia#5195: I have modified method setButtonTint to avoid an
error due to using a restricted API.
This method(bindingAdapter) is not set in any of the layouts. Only test
is written for it.
So it is safety to modify the test also. If not modify a test - it is
failed then.

**Lint report before**
<img
src="https://github.com/oppia/oppia-android/assets/71126152/fe9d691b-1bd0-45e9-9f14-7daa73839069"
width="70%" height="70%" alt="callingNewApiBefore">

**Lint report after**
<img
src="https://github.com/oppia/oppia-android/assets/71126152/5689d095-d4ed-4e60-b431-790037b240c3"
width="50%" height="50%" alt="callingNewApiBefore">


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app/src/main/java/org/oppia/android/app/databinding/AppCompatCheckBoxBindingAdapters.java

@@ -4,6 +4,7 @@
 import androidx.annotation.ColorInt;
 import androidx.annotation.NonNull;
 import androidx.appcompat.widget.AppCompatCheckBox;
+import androidx.core.widget.CompoundButtonCompat;
 import androidx.databinding.BindingAdapter;
 
 /**
@@ -13,6 +14,6 @@ public final class AppCompatCheckBoxBindingAdapters {
   /** Sets the button tint for the specified checkbox, via data-binding. */
   @BindingAdapter("app:buttonTint")
   public static void setButtonTint(@NonNull AppCompatCheckBox checkBox, @ColorInt int colorRgb) {
-    checkBox.setSupportButtonTintList(ColorStateList.valueOf(colorRgb));
+    CompoundButtonCompat.setButtonTintList(checkBox, ColorStateList.valueOf(colorRgb));
   }
 }

app/src/sharedTest/java/org/oppia/android/app/databinding/AppCompatCheckBoxBindingAdaptersTest.kt

@@ -127,7 +127,7 @@ class AppCompatCheckBoxBindingAdaptersTest {
     activityRule.scenario.onActivity {
       val appCompatCheckBox: AppCompatCheckBox = getAppCompatCheckBox(it)
       setButtonTint(appCompatCheckBox, colorRgb)
-      assertThat(appCompatCheckBox.supportButtonTintList?.defaultColor).isEqualTo(colorRgb)
+      assertThat(appCompatCheckBox.buttonTintList?.defaultColor).isEqualTo(colorRgb)
     }
   }