no retroactive, it's not supported until Xcode 15

Sources/Voxelotl/Application.swift

@@ -174,7 +174,7 @@ fileprivate enum ApplicationExecutionState {
   case running
 }
 
-extension FileHandle: @retroactive TextOutputStream {
+extension FileHandle: TextOutputStream {
   public func write(_ string: String) {
     self.write(Data(string.utf8))
   }