Update json-parser to latest version

This updates json-parser to the latest version of the master branch as of today, as there are no new releases of json-parser after version 1.1.0.

In particular this update adds `json_object_entry` to allow iterating through objects' key-value entries.

src/engine/external/json-parser/LICENSE

@@ -1,17 +1,17 @@
 
- Copyright (C) 2012, 2013 James McLaughlin et al. All rights reserved.
- 
+ Copyright (C) 2012-2021 the json-parser authors All rights reserved.
+
  Redistribution and use in source and binary forms, with or without
  modification, are permitted provided that the following conditions
  are met:
- 
+
  1. Redistributions of source code must retain the above copyright
  notice, this list of conditions and the following disclaimer.
- 
+
  2. Redistributions in binary form must reproduce the above copyright
  notice, this list of conditions and the following disclaimer in the
  documentation and/or other materials provided with the distribution.
- 
+
  THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
@@ -23,4 +23,3 @@
  LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  SUCH DAMAGE.
-

src/engine/external/json-parser/VERSION.txt

@@ -1 +1,3 @@
-1.1.0
+https://github.com/json-parser/json-parser
+git revision 94f66d8f83c1d84ccccd7540ec2f51cf8325d272
+(latest as of 2023-07-25)