Remove @Beta from Utf8.

RELNOTES=Remove `@Beta` from `Utf8`.
PiperOrigin-RevId: 523109358

Author: kluever

android/guava/src/com/google/common/base/Utf8.java

@@ -18,7 +18,6 @@
 import static java.lang.Character.MAX_SURROGATE;
 import static java.lang.Character.MIN_SURROGATE;
 
-import com.google.common.annotations.Beta;
 import com.google.common.annotations.GwtCompatible;
 
 /**
@@ -36,7 +35,6 @@
  * @author Clément Roux
  * @since 16.0
  */
-@Beta
 @GwtCompatible(emulated = true)
 @ElementTypesAreNonnullByDefault
 public final class Utf8 {

guava/src/com/google/common/base/Utf8.java

@@ -18,7 +18,6 @@
 import static java.lang.Character.MAX_SURROGATE;
 import static java.lang.Character.MIN_SURROGATE;
 
-import com.google.common.annotations.Beta;
 import com.google.common.annotations.GwtCompatible;
 
 /**
@@ -36,7 +35,6 @@
  * @author Clément Roux
  * @since 16.0
  */
-@Beta
 @GwtCompatible(emulated = true)
 @ElementTypesAreNonnullByDefault
 public final class Utf8 {