fix(ci,rust): proc-macro2をv1.0.95に上げる (#1078)

CIのrustdoc生成が落ちているため。

## 関連 Issue

Refs: dtolnay/proc-macro2#497

Author: qryxip

Cargo.lock

@@ -67,7 +67,7 @@ parse-display = "0.8.2"
 pollster = "0.3.0"
 predicates = "3.1.2"
 pretty_assertions = "1.4.1"
-proc-macro2 = "1.0.86"
+proc-macro2 = "1.0.95"
 pyo3 = "0.23.4"
 pyo3-log = "0.12.1"
 quote = "1.0.37"