Update extern/json subproject to latest commit

riccardodebenedictis · riccardodebenedictis · commit 0210a2929067 · 2025-11-27T11:28:25.000+01:00
diff --git a/extern/json b/extern/json
@@ -1 +1 @@
-Subproject commit 8f69ce8314ee7576a6d53c9367db14daf69a6de2
+Subproject commit 6f5c697cd2c2274512f80bdc33b3d73a45120cb5
