[BottomNavigationView] Update max item count to 6

PiperOrigin-RevId: 650353790

Author: imhappi

lib/java/com/google/android/material/bottomnavigation/BottomNavigationView.java

@@ -92,7 +92,7 @@
  * href="https://material.io/components/navigation-bar/overview">design guidelines</a>.
  */
 public class BottomNavigationView extends NavigationBarView {
-  private static final int MAX_ITEM_COUNT = 5;
+  private static final int MAX_ITEM_COUNT = 6;
 
   public BottomNavigationView(@NonNull Context context) {
     this(context, null);

lib/java/com/google/android/material/navigation/NavigationBarMenuView.java

@@ -63,7 +63,7 @@
  */
 @RestrictTo(LIBRARY_GROUP)
 public abstract class NavigationBarMenuView extends ViewGroup implements MenuView {
-  private static final int ITEM_POOL_SIZE = 5;
+  private static final int ITEM_POOL_SIZE = 7;
   private static final int NO_PADDING = -1;
 
   private static final int[] CHECKED_STATE_SET = {android.R.attr.state_checked};