Fix checkstyle

proxy/src/main/java/com/velocitypowered/proxy/util/collect/CappedSet.java

@@ -38,7 +38,8 @@ public class CappedSet<T> extends ForwardingSet<T> {
   @Override
   public boolean add(T element) {
     if (this.delegate.size() >= upperSize) {
-      Preconditions.checkState(this.delegate.contains(element), "collection is too large (%s >= %s)",
+      Preconditions.checkState(this.delegate.contains(element),
+          "collection is too large (%s >= %s)",
           this.delegate.size(), this.upperSize);
       return false;
     }

proxy/src/test/java/com/velocitypowered/proxy/util/collect/CappedSetTest.java

@@ -1,6 +1,9 @@
 package com.velocitypowered.proxy.util.collect;
 
-import static org.junit.jupiter.api.Assertions.*;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+import static org.junit.jupiter.api.Assertions.assertTrue;
 
 import com.google.common.collect.ImmutableSet;
 import java.util.Collection;