Update Collections.

Author: gk-brown

build.gradle

@@ -14,7 +14,7 @@
 
 subprojects {
     group = 'org.httprpc'
-    version = '5.3.2'
+    version = '5.3.3'
 
     repositories {
         mavenCentral()

kilo-client/src/main/java/org/httprpc/kilo/util/Collections.java

@@ -135,7 +135,7 @@ public static <K, V> Map<K, V> immutableMapOf(Map.Entry<K, V>... entries) {
      * A map containing the provided entries sorted by key.
      */
     @SafeVarargs
-    public static <K extends Comparable<K>, V> SortedMap<K, V> sortedMapOf(Map.Entry<K, V>... entries) {
+    public static <K extends Comparable<? super K>, V> SortedMap<K, V> sortedMapOf(Map.Entry<K, V>... entries) {
         var map = new TreeMap<K, V>();
 
         for (var entry : entries) {
@@ -218,7 +218,7 @@ public static <E> Set<E> immutableSetOf(E... elements) {
      * A sorted set containing the provided elements.
      */
     @SafeVarargs
-    public static <E extends Comparable<E>> SortedSet<E> sortedSetOf(E... elements) {
+    public static <E extends Comparable<? super E>> SortedSet<E> sortedSetOf(E... elements) {
         var set = new TreeSet<E>();
 
         java.util.Collections.addAll(set, elements);