Make c.g.c.base.Objects methods delegate to j.u.Objects.

This _would_ prepare for adding `@InlineMe` except that I don't expect that to work well when both the "before" and "after" try to import a class named "`Objects`." Still, this change at least establishes the a migration from our methods to the JDK's is safe.

RELNOTES=n/a
PiperOrigin-RevId: 778491389

Author: cpovirk

android/guava/src/com/google/common/base/Objects.java

@@ -49,7 +49,7 @@ private Objects() {}
    * java.util.Objects#equals} instead.
    */
   public static boolean equal(@Nullable Object a, @Nullable Object b) {
-    return a == b || (a != null && a.equals(b));
+    return java.util.Objects.equals(a, b);
   }
 
   /**
@@ -73,7 +73,8 @@ public static boolean equal(@Nullable Object a, @Nullable Object b) {
    * <p><b>Note:</b> this method is now unnecessary and should be treated as deprecated; use {@link
    * java.util.Objects#hash} instead.
    */
+  @SuppressWarnings("nullness") // https://github.com/jspecify/jdk/pull/127
   public static int hashCode(@Nullable Object @Nullable ... objects) {
-    return Arrays.hashCode(objects);
+    return java.util.Objects.hash(objects);
   }
 }

guava/src/com/google/common/base/Objects.java

@@ -49,7 +49,7 @@ private Objects() {}
    * java.util.Objects#equals} instead.
    */
   public static boolean equal(@Nullable Object a, @Nullable Object b) {
-    return a == b || (a != null && a.equals(b));
+    return java.util.Objects.equals(a, b);
   }
 
   /**
@@ -73,7 +73,8 @@ public static boolean equal(@Nullable Object a, @Nullable Object b) {
    * <p><b>Note:</b> this method is now unnecessary and should be treated as deprecated; use {@link
    * java.util.Objects#hash} instead.
    */
+  @SuppressWarnings("nullness") // https://github.com/jspecify/jdk/pull/127
   public static int hashCode(@Nullable Object @Nullable ... objects) {
-    return Arrays.hashCode(objects);
+    return java.util.Objects.hash(objects);
   }
 }