Update Rust crate syn to v2

renovate[bot] · web-flow · commit d252c13b1015 · 2023-12-21T00:35:02.000Z
diff --git a/eq-macro/Cargo.toml b/eq-macro/Cargo.toml
@@ -11,4 +11,4 @@ proc-macro = true
 
 [dependencies]
 quote = "1.0.15"
-syn = "1.0.86"
+syn = "2.0.42"
