Bump spms version to 0.4.0-beta2

Author: toasterofbread

buildSrc/src/main/kotlin/plugins/spmp/Dependencies.kt

@@ -28,7 +28,7 @@ class SpMpDeps(extra: Map<String, Any>) {
     val dependencies: Map<String, DependencyInfo> =
         mapOf(
             "dev.toastbits:spms" to DependencyInfo(
-                version = "0.4.0-alpha4",
+                version = "0.4.0-beta2",
                 name = "spmp-server",
                 author = "toasterofbread",
                 url = "https://github.com/toasterofbread/spmp-server",