chore(deps): bump proc-macro2 from 1.0.40 to 1.0.42 (#1513)

Bumps [proc-macro2](https://github.com/dtolnay/proc-macro2) from 1.0.40 to 1.0.42.
- [Release notes](https://github.com/dtolnay/proc-macro2/releases)
- [Commits](dtolnay/proc-macro2@1.0.40...1.0.42)

---
updated-dependencies:
- dependency-name: proc-macro2
  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

@@ -40,7 +40,7 @@ cargo_metadata = { version = "0.15.0", optional = true }
 # eip712 feature enabled dependencies
 convert_case = { version = "0.5.0", optional = true }
 syn = { version = "1.0.98", optional = true }
-proc-macro2 = { version = "1.0.40", optional = true }
+proc-macro2 = { version = "1.0.42", optional = true }
 rust_decimal = "1.25.0"
 
 [dev-dependencies]