build(deps): bump syn from 1.0.39 to 1.0.40

Bumps [syn](https://github.com/dtolnay/syn) from 1.0.39 to 1.0.40.
- [Release notes](https://github.com/dtolnay/syn/releases)
- [Commits](https://github.com/dtolnay/syn/compare/1.0.39...1.0.40)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Cargo.lock

@@ -1562,9 +1562,9 @@ checksum = "502d53007c02d7605a05df1c1a73ee436952781653da5d0bf57ad608f66932c1"
 
 [[package]]
 name = "syn"
-version = "1.0.39"
+version = "1.0.40"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "891d8d6567fe7c7f8835a3a98af4208f3846fba258c1bc3c31d6e506239f11f9"
+checksum = "963f7d3cc59b59b9325165add223142bbf1df27655d07789f109896d353d8350"
 dependencies = [
  "proc-macro2",
  "quote",