Change legacy support UI dependency to more specific ViewPager dependency.

PiperOrigin-RevId: 247902405

demos/main/build.gradle

@@ -63,7 +63,7 @@ android {
 
 dependencies {
     implementation 'androidx.annotation:annotation:1.0.2'
-    implementation 'com.android.support:support-core-ui:' + supportLibraryVersion
+    implementation 'androidx.viewpager:viewpager:1.0.0'
     implementation 'androidx.fragment:fragment:1.0.0'
     implementation 'com.google.android.material:material:1.0.0'
     implementation project(modulePrefix + 'library-core')