Update dependency rules_rust to v0.40.0 (#279)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

tests/WORKSPACE

@@ -191,8 +191,8 @@ go_download_sdk(
 
 http_archive(
     name = "rules_rust",
-    sha256 = "1ae45a413d0b9433987320df2ad410db6a15fafb6c88cf0fd1bf3baacbe826db",
-    urls = ["https://github.com/bazelbuild/rules_rust/releases/download/0.39.0/rules_rust-v0.39.0.tar.gz"],
+    sha256 = "c30dfdf1e86fd50650a76ea645b3a45f2f00667b06187a685e9554e167ca97ee",
+    urls = ["https://github.com/bazelbuild/rules_rust/releases/download/0.40.0/rules_rust-v0.40.0.tar.gz"],
 )
 
 load("@rules_rust//rust:repositories.bzl", "rules_rust_dependencies", "rust_register_toolchains")