Revert "Use Spigot's Maven repository"

This reverts commit e68d229674.

pom.xml

@@ -50,12 +50,6 @@
       <distribution>repo</distribution>
     </license>
   </licenses>
-  <repositories>
-    <repository>
-      <id>spigot-repo</id>
-      <url>https://hub.spigotmc.org/nexus/content/groups/public/</url>
-    </repository>
-  </repositories>
   <!-- Dependencies -->
   <dependencies>
     <dependency>
@@ -431,4 +425,4 @@
       </build>
     </profile>
   </profiles>
-</project>
+</project>