chore(deps): bump syn from 1.0.91 to 1.0.92 (gakonst#1194)

Bumps [syn](https://github.com/dtolnay/syn) from 1.0.91 to 1.0.92.
- [Release notes](https://github.com/dtolnay/syn/releases)
- [Commits](dtolnay/syn@1.0.91...1.0.92)

---
updated-dependencies:
- dependency-name: syn
  dependency-type: direct:production
  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>

ethers-core/Cargo.toml

@@ -35,7 +35,7 @@ cargo_metadata = { version = "0.14.2", optional = true }
 
 # eip712 feature enabled dependencies
 convert_case = { version = "0.5.0", optional = true }
-syn = { version = "1.0.91", optional = true }
+syn = { version = "1.0.92", optional = true }
 proc-macro2 = { version = "1.0.37", optional = true }
 
 [dev-dependencies]