Fixes for changes in std.json API (#107)

tools/regz/src/Database.zig

@@ -885,7 +885,7 @@ pub fn json_stringify(
     var obj = try regzon.to_json(db);
     defer obj.deinit();
 
-    try obj.value.jsonStringify(opts, writer);
+    try std.json.stringify(obj.value, opts, writer);
 }
 
 pub fn format(

tools/regz/src/main.zig

@@ -138,7 +138,7 @@ fn main_impl() anyerror!void {
     var buffered = std.io.bufferedWriter(raw_writer);
     if (res.args.json != 0)
         try db.json_stringify(
-            .{ .whitespace = .{ .indent = .{ .space = 2 } } },
+            .{ .whitespace = .indent_2 },
             buffered.writer(),
         )
     else