fix: bitrot building with -Duse_tree_sitter=false

build.zig.zon

@@ -1,6 +1,6 @@
 .{
     .name = .flow_syntax,
-    .version = "0.1.0",
+    .version = "0.6.0",
     .fingerprint = 0x3ba2584ea1cec85f,
     .minimum_zig_version = "0.15.0",
 

src/treez_dummy.zig

@@ -87,6 +87,7 @@ pub const Tree = struct {
     pub fn edit(_: *Tree, _: *const InputEdit) void {}
 };
 pub const Node = struct {
+    tree: ?*Tree = null,
     var dummy: @This() = .{};
     pub fn getRange(_: *const @This()) Range {
         return .{};