Fix checkstyle

Author: Nicholas DeJaco

core/sdk-core/src/main/java/software/amazon/awssdk/core/interceptor/ExecutionAttribute.java

@@ -15,10 +15,8 @@
 
 package software.amazon.awssdk.core.interceptor;
 
-import software.amazon.awssdk.annotations.SdkPublicApi;
-import software.amazon.awssdk.core.RequestOverrideConfiguration;
-
 import java.util.Objects;
+import software.amazon.awssdk.annotations.SdkPublicApi;
 
 /**
  * An attribute attached to a particular execution, stored in {@link ExecutionAttributes}.

core/sdk-core/src/main/java/software/amazon/awssdk/core/interceptor/UnmodifiableExecutionAttributes.java

@@ -15,6 +15,9 @@
 
 package software.amazon.awssdk.core.interceptor;
 
+import software.amazon.awssdk.annotations.SdkPublicApi;
+
+@SdkPublicApi
 public  class UnmodifiableExecutionAttributes extends ExecutionAttributes {
     public UnmodifiableExecutionAttributes(ExecutionAttributes executionAttributes) {
         super(executionAttributes.getAttributes());