Update rusherhack-plugin.json

- update Minecraft versions

Author: GarlicRot

src/main/resources/rusherhack-plugin.json

@@ -7,6 +7,12 @@
     "Garlicrot"
   ],
   "Minecraft-Versions": [
-    "${project.minecraft_version}"
+    "1.20.5",
+    "1.20.6",
+    "1.21",
+    "1.21.1",
+    "1.21.2",
+    "1.21.3",
+    "1.21.4"
   ]
 }