Migrate usages of Truth8.assertThat to equivalent usages of `Truth.…

…assertThat`.

The `Truth8` methods will be deprecated (or hidden) in the future. Callers should move to `Truth`.

Some (but not all) of the CLs in this batch require Truth [1.4.0](https://github.com/google/truth/releases/tag/v1.4.0). I submitted a CL earlier today to (I hope) perform that upgrade for your project.

PiperOrigin-RevId: 604731456

core/test/com/google/inject/util/EnhancedTest.java

@@ -3,7 +3,6 @@
 import static com.google.common.truth.Truth.assertThat;
 import static org.junit.Assume.assumeTrue;
 
-import com.google.common.truth.Truth8;
 import com.google.inject.AbstractModule;
 import com.google.inject.Guice;
 import com.google.inject.Injector;
@@ -46,8 +45,8 @@ public void unenhancedClass() {
     assertThat(bar.bar()).isEqualTo("bar");
 
     // The actual tests.
-    Truth8.assertThat(Enhanced.unenhancedClass(foo.getClass())).isEqualTo(Optional.of(Foo.class));
-    Truth8.assertThat(Enhanced.unenhancedClass(bar.getClass())).isEmpty();
+    assertThat(Enhanced.unenhancedClass(foo.getClass())).isEqualTo(Optional.of(Foo.class));
+    assertThat(Enhanced.unenhancedClass(bar.getClass())).isEmpty();
   }
 
   private static class InterceptingModule extends AbstractModule {