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

riccardodebenedictis · riccardodebenedictis · commit e6fcc2f2f2cd · 2025-10-31T14:05:10.000+01:00
diff --git a/extern/json b/extern/json
@@ -1 +1 @@
-Subproject commit 91a22286b93d5757803f44de54fa401dc7f03b90
+Subproject commit dc550ec0c21727a14907d4562a955bbb800ed1b7
