Pull in proc-macro2 sccache fix

Author: dtolnay

Cargo.toml

@@ -15,9 +15,9 @@ rust-version = "1.56"
 proc-macro = true
 
 [dependencies]
-proc-macro2 = "1.0.63"
-quote = "1.0.29"
-syn = { version = "2.0.23", features = ["full", "visit-mut"] }
+proc-macro2 = "1.0.74"
+quote = "1.0.35"
+syn = { version = "2.0.46", features = ["full", "visit-mut"] }
 
 [dev-dependencies]
 futures = "0.3.30"