build: add 1.21.4 to the modrinth supported versions

Author: WolfyScript

build.gradle.kts

@@ -125,7 +125,7 @@ modrinth {
     versionType.set("release") // TODO: Automatically determine this from the version
     uploadFile.set(tasks.shadowJar) // Use the shadowed jar !!
     changelog.set(System.getenv("CHANGELOG"))
-    gameVersions.addAll("1.21.5", "1.21.6", "1.21.7", "1.21.8") // Must be an array, even with only one version
+    gameVersions.addAll("1.21.4", "1.21.5", "1.21.6", "1.21.7", "1.21.8") // Must be an array, even with only one version
     loaders.addAll("bukkit", "spigot", "paper", "purpur") // Must also be an array - no need to specify this if you're using Loom or ForgeGradle
     dependencies { // A special DSL for creating dependencies
         // scope.type