build(ariadne): vendor serde crates

third_party/crates/serde_json-1.0.151/tests/ui/not_found.stderr

@@ -0,0 +1,5 @@
+error[E0425]: cannot find value `x` in this scope
+ --> tests/ui/not_found.rs:4:19
+  |
+4 |     json!({ "a" : x });
+  |                   ^ not found in this scope