Bumps the following dependencies:
- nim-ethers to commit 507ac6a4cc71cec9be7693fa393db4a49b52baf9 which contains a pinned nim-eth version. This is to be replaced by a versioned library, so it will be pinned to a particular version. There is a crucial fix in this version of ethers that fixes nonce management which is causing issues in the Codex testnet.
- nim-json-rpc to v0.4.4
- nim-json-serialization to v0.2.8
- nim-serde to v1.2.2
- nim-serialization to v0.2.4
Currently, one of the integration tests is failing.