fix: now builds on stable zig

src/action.zig

@@ -8,7 +8,7 @@ pub const Action = enum {
 
     pub fn execute(
         self: Action,
-        handle_out: *?std.ChildProcess,
+        handle_out: *?*std.ChildProcess,
         alloc: std.mem.Allocator,
     ) !void {
         std.log.info("Executing action {s}", .{@tagName(self)});
@@ -19,7 +19,7 @@ pub const Action = enum {
             .hibernate => "hibernate",
         } };
 
-        var child = std.ChildProcess.init(&argv, alloc);
+        var child = try std.ChildProcess.init(&argv, alloc);
         try child.spawn();
         handle_out.* = child;
     }

src/gui.zig

@@ -5,7 +5,7 @@ const c = ffi.c;
 const ffi = @import("ffi.zig");
 
 pub const GuiState = struct {
-    child: ?std.ChildProcess = null,
+    child: ?*std.ChildProcess = null,
     alloc: std.mem.Allocator,
     /// Allocator used to allocate userdata that will be cleared at the
     /// end of the application lifespan

src/main.zig

@@ -64,7 +64,7 @@ pub fn main() !u8 {
     );
 
     if (state.child) |*ch| {
-        _ = try ch.wait();
+        _ = try ch.*.wait();
     }
 
     return @intCast(u8, status);