Update ethers-core requirement from =2.0.6 to =2.0.8

Updates the requirements on [ethers-core](https://github.com/gakonst/ethers-rs) to permit the latest version.
- [Release notes](https://github.com/gakonst/ethers-rs/releases)
- [Changelog](https://github.com/gakonst/ethers-rs/blob/master/CHANGELOG.md)
- [Commits](gakonst/ethers-rs@ethers-core-v2.0.6...ethers-core-v2.0.8)

---
updated-dependencies:
- dependency-name: ethers-core
  dependency-type: direct:production
...

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

Author: dependabot[bot]

Cargo.toml

@@ -20,7 +20,7 @@ cert-manager = "0.0.10" # https://github.com/gyuho/cert-manager
 chrono = "0.4.24"
 cmp-manager = "0.0.1"
 ecdsa = { version = "0.16.7", features = ["rfc6979", "verifying"] } # https://github.com/RustCrypto/elliptic-curves/tree/master/k256
-ethers-core = { version = "=2.0.7", features = ["eip712"] } # https://github.com/gakonst/ethers-rs/releases
+ethers-core = { version = "=2.0.8", features = ["eip712"] } # https://github.com/gakonst/ethers-rs/releases
 hex = "0.4.3"
 hmac = "0.12.1"
 hyper = { version = "0.14.26"}