Switch to new sk89q repo (#4791)

pom.xml

@@ -226,8 +226,8 @@
             <url>https://repo.codemc.org/repository/maven-public</url>
         </repository>
         <repository>
-            <id>sk89q-repo</id>
-            <url>https://maven.sk89q.com/repo/</url>
+            <id>enginehub-repo</id>
+            <url>https://maven.enginehub.org/repo/</url>
         </repository>
         <repository> <!-- for development builds -->
             <id>sonatype-oss</id>