Update json subproject to latest commit for improved functionality and compatibility.

riccardodebenedictis · riccardodebenedictis · commit 2475665a029d · 2025-10-31T15:38:12.000+01:00
diff --git a/extern/json b/extern/json
@@ -1 +1 @@
-Subproject commit dc550ec0c21727a14907d4562a955bbb800ed1b7
+Subproject commit 0216df705d6ded4f00b468170ca5b2b3e591bcaa
