Bump proc-macro2 from 1.0.39 to 1.0.40 (#379)

Bumps [proc-macro2](https://github.com/dtolnay/proc-macro2) from 1.0.39 to 1.0.40.
- [Release notes](https://github.com/dtolnay/proc-macro2/releases)
- [Commits](dtolnay/proc-macro2@1.0.39...1.0.40)

---
updated-dependencies:
- dependency-name: proc-macro2
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

Cargo.lock

@@ -22,7 +22,7 @@ indexmap = "1.8.2"
 openapiv3 = "=1.0.1"
 paste = "1.0.7"
 percent-encoding = "2.1.0"
-proc-macro2 = "1.0.39"
+proc-macro2 = "1.0.40"
 rustls = "0.20.6"
 rustls-pemfile = "1.0.0"
 serde_json = "1.0.81"