chor: bump zig version and fix corresponding errors

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);