Switch to higher level XPC & enforce signing requirements (#681)

* Revert "Add launch constraints (#678)"

This reverts commit c5a610d786.

* .

* Cleanup.

Sources/SecretiveUpdater/SecretiveUpdater.swift

@@ -0,0 +1,17 @@
+import Foundation
+import OSLog
+import XPCWrappers
+import Brief
+
+final class SecretiveUpdater: NSObject, XPCProtocol {
+
+    enum Constants {
+        static let updateURL = URL(string: "https://api.github.com/repos/maxgoedjen/secretive/releases")!
+    }
+
+    func process(_: Data) async throws -> [Release] {
+        let (data, _) = try await URLSession.shared.data(from: Constants.updateURL)
+        return try JSONDecoder().decode([Release].self, from: data)
+    }
+
+}