build(ariadne): vendor serde crates

third_party/crates/proc-macro2-1.0.107/src/probe.rs

@@ -0,0 +1,10 @@
+#![allow(dead_code)]
+
+#[cfg(proc_macro_span)]
+pub(crate) mod proc_macro_span;
+
+#[cfg(proc_macro_span_file)]
+pub(crate) mod proc_macro_span_file;
+
+#[cfg(proc_macro_span_location)]
+pub(crate) mod proc_macro_span_location;