Add missing aikar repository

Signed-off-by: applenick <applenick@users.noreply.github.com>

Author: applenick

pom.xml

@@ -27,6 +27,10 @@
             <name>PGM Repository</name>
             <url>https://repo.pgm.fyi/snapshots</url>
         </repository>
+        <repository>
+            <id>aikar</id>
+            <url>https://repo.aikar.co/content/groups/aikar/</url>
+        </repository>
         <repository>
             <id>spigot-repo</id>
             <url>https://hub.spigotmc.org/nexus/content/repositories/snapshots/</url>