chore(deps): bump once_cell from 1.7.2 to 1.8.0 (#317)

Bumps [once_cell](https://github.com/matklad/once_cell) from 1.7.2 to 1.8.0.
- [Release notes](https://github.com/matklad/once_cell/releases)
- [Changelog](https://github.com/matklad/once_cell/blob/master/CHANGELOG.md)
- [Commits](matklad/once_cell@v1.7.2...v1.8.0)

---
updated-dependencies:
- dependency-name: once_cell
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

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

ethers-contract/Cargo.toml

@@ -19,7 +19,7 @@ ethers-contract-derive = { version = "0.2.2", path = "ethers-contract-derive", o
 serde = { version = "1.0.124", default-features = false }
 serde_json = { version = "1.0.64", default-features = false }
 thiserror = { version = "1.0.24", default-features = false }
-once_cell = { version = "1.7.2", default-features = false }
+once_cell = { version = "1.8.0", default-features = false }
 pin-project = {version = "1.0.7", default-features = false }
 futures-util = { version = "0.3.14", default-features = false }
 hex = { version = "0.4.3", default-features = false, features = ["std"] }

ethers-core/Cargo.toml

@@ -43,7 +43,7 @@ ethers = { version = "0.2", path = "../ethers" }
 
 serde_json = { version = "1.0.64", default-features = false }
 bincode = { version = "1.3.3", default-features = false }
-once_cell = { version = "1.7.2" }
+once_cell = { version = "1.8.0" }
 
 
 [features]