mod: bump zg dependency version

As the dependency is still using version 0.14.0, it still causes an
error during testing. Corresponding examples are still working as
expected.

build.zig.zon

@@ -37,8 +37,8 @@
     // internet connectivity.
     .dependencies = .{
         .zg = .{
-            .url = "git+https://codeberg.org/atman/zg#4a002763419a34d61dcbb1f415821b83b9bf8ddc",
-            .hash = "1220f3e29bc40856bfc06e0ee133f814b0011c76de987d8a6a458c2f34d82708899a",
+            .url = "git+https://codeberg.org/atman/zg#0b05141b033043c5f7bcd72048a48eef6531ea6c",
+            .hash = "zg-0.14.0-oGqU3KEFswIffnDu8eAE2XlhzwcfgjwtM6akIc5L7cEV",
         },
     },
     .paths = .{

src/app.zig

@@ -55,7 +55,7 @@ pub fn App(comptime E: type) type {
                 handler_ctx = this;
                 var act = posix.Sigaction{
                     .handler = .{ .handler = handleWinch },
-                    .mask = posix.empty_sigset,
+                    .mask = posix.sigemptyset(),
                     .flags = 0,
                 };
                 posix.sigaction(posix.SIG.WINCH, &act, null);