update ethers to latest version

Github

Install act https://github.com/nektos/act
Add - run: sleep 1h line to main.yml. This will prevent docker container from exiting
Execute act pull_request
In a separate terminal attach to a running container
```
docker exec -it act-Main-Workflow-build bash
```

Inside running container update $PATH env to access node and yarn

export PATH="$PATH:/opt/hostedtoolcache/node/16.15.0/x64/bin/"

node -v
v16.15.0

Create test event file test.json

{
  "action": "workflow_dispatch",
  "inputs": {
    "synthetix_version": "2.71.0",
    "monorepo_version": ""
  }
}

Add - run: sleep 1h line to updateDependency.yml (where appropriate). This will prevent docker container from exiting

Run act

act workflow_dispatch --eventpath test.json

In a separate terminal attach to a running container

docker exec -it act-Publish-Library-Update-synthetix-in-contracts-interface bash

Inside running container update $PATH env to access node and npm

export PATH="$PATH:/opt/hostedtoolcache/node/16.15.0/x64/bin/"

node -v
v16.15.0

To kill a running container:

docker kill act-Publish-Library-Update-synthetix-in-contracts-interface