chore(deps): bump once_cell from 1.5.2 to 1.6.0 (#206)

Bumps [once_cell](https://github.com/matklad/once_cell) from 1.5.2 to 1.6.0.
- [Release notes](https://github.com/matklad/once_cell/releases)
- [Changelog](https://github.com/matklad/once_cell/blob/master/CHANGELOG.md)
- [Commits](https://github.com/matklad/once_cell/compare/v1.5.2...v1.6.0)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>

Cargo.lock

@@ -1404,9 +1404,9 @@ checksum = "8d3b63360ec3cb337817c2dbd47ab4a0f170d285d8e5a2064600f3def1402397"
 
 [[package]]
 name = "once_cell"
-version = "1.5.2"
+version = "1.6.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "13bd41f508810a131401606d54ac32a467c97172d74ba7662562ebba5ad07fa0"
+checksum = "4ad167a2f54e832b82dbe003a046280dceffe5227b5f79e08e363a29638cfddd"
 
 [[package]]
 name = "opaque-debug"

ethers-contract/Cargo.toml

@@ -19,7 +19,7 @@ ethers-contract-derive = { version = "0.2", path = "ethers-contract-derive", opt
 serde = { version = "1.0.123", default-features = false }
 serde_json = { version = "1.0.62", default-features = false }
 thiserror = { version = "1.0.24", default-features = false }
-once_cell = { version = "1.5.2", default-features = false }
+once_cell = { version = "1.6.0", default-features = false }
 pin-project = {version = "1.0.5", default-features = false }
 futures-util = { version = "0.3.12", default-features = false }
 hex = { version = "0.4.2", default-features = false, features = ["std"] }

ethers-core/Cargo.toml

@@ -42,7 +42,7 @@ ethers = { version = "0.2", path = "../ethers" }
 
 serde_json = { version = "1.0.62", default-features = false }
 bincode = { version = "1.2.1", default-features = false }
-once_cell = { version = "1.5.2" }
+once_cell = { version = "1.6.0" }
 
 
 [features]