build(deps): bump syn from 2.0.114 to 2.0.115 (#4438)

Bumps [syn](https://github.com/dtolnay/syn) from 2.0.114 to 2.0.115.
- [Release notes](https://github.com/dtolnay/syn/releases)
- [Commits](dtolnay/syn@2.0.114...2.0.115)

---
updated-dependencies:
- dependency-name: syn
  dependency-version: 2.0.115
  dependency-type: indirect
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: katelyn martin <kate@buoyant.io>

Author: dependabot[bot]

Cargo.lock

@@ -3741,9 +3741,9 @@ dependencies = [
 
 [[package]]
 name = "syn"
-version = "2.0.114"
+version = "2.0.115"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d4d107df263a3013ef9b1879b0df87d706ff80f65a86ea879bd9c31f9b307c2a"
+checksum = "6e614ed320ac28113fa64972c4262d5dbc89deacdfd00c34a3e4cea073243c12"
 dependencies = [
  "proc-macro2",
  "quote",