Fix checkstyles errors

Signed-off-by: Antonio Sanchez <[email protected]>

Author: SanchAnt

sdk/src/main/java/io/dapr/client/AbstractDaprClient.java

@@ -48,7 +48,11 @@
 import reactor.core.publisher.Flux;
 import reactor.core.publisher.Mono;
 
-import java.util.*;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.List;
+import java.util.Map;
 import java.util.stream.Collectors;
 
 /**
@@ -489,8 +493,7 @@ public Mono<Void> saveState(String storeName, String key, Object value) {
    */
   @Override
   public Mono<Void> saveState(String storeName, String key, String etag, Object value, StateOptions options) {
-    Map<String, String> meta = new HashMap<>();
-    meta.put("contentType", stateSerializer.getContentType());
+    Map<String, String> meta = Collections.singletonMap("contentType", stateSerializer.getContentType());
     State<?> state = new State<>(key, value, etag, meta, options);
     return this.saveBulkState(storeName, Collections.singletonList(state));
   }