Update extern/json subproject to latest commit

riccardodebenedictis · riccardodebenedictis · commit b9e497aff5ee · 2025-12-22T11:57:19.000+01:00
diff --git a/extern/json b/extern/json
@@ -1 +1 @@
-Subproject commit fd715f2bdf7a4c0055bb15b3729412f52976701f
+Subproject commit 65838ed3a0516a2cbe51044a9b7e6e3a36897fc3
