Update out-of-date lockfile

Change-Id: I9522a8bb22f2e50d5d7074aec09ae56558b36c7c
diff --git a/rustc_deps/Cargo.lock b/rustc_deps/Cargo.lock
index 258e9b0..93a1dbe 100644
--- a/rustc_deps/Cargo.lock
+++ b/rustc_deps/Cargo.lock
@@ -1007,8 +1007,8 @@
 version = "0.2.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "proc-macro2 0.4.24 (registry+https://github.com/rust-lang/crates.io-index)",
- "quote 0.6.10 (registry+https://github.com/rust-lang/crates.io-index)",
+ "proc-macro2 0.4.27 (registry+https://github.com/rust-lang/crates.io-index)",
+ "quote 0.6.11 (registry+https://github.com/rust-lang/crates.io-index)",
  "syn 0.15.26 (registry+https://github.com/rust-lang/crates.io-index)",
 ]