chore: apply code formatting with spotless

Author: github-actions[bot]

flow-server/src/main/java/com/vaadin/flow/function/SerializableBiFunction.java

@@ -13,7 +13,7 @@
  * License for the specific language governing permissions and limitations under
  * the License.
  */
-               package com.vaadin.flow.function;
+package com.vaadin.flow.function;
 
 import java.io.Serializable;
 import java.util.function.BiFunction;
@@ -33,7 +33,7 @@
  * @param <R>
  *            the type of the result of the function
  */
-@FunctionalInterface                            
+@FunctionalInterface
 public interface SerializableBiFunction<T, U, R>
         extends BiFunction<T, U, R>, Serializable {
     // Only method inherited from BiFunction abc