fix: updates cross chain

[uF4No]

What 💻

• Updates code with changes in fix: cross-chain governance zkSync-Community-Hub/community-code#32

Why ✋

• Outdated tutorial

Evidence 📷

Include screenshots, screen recordings, or console output here demonstrating that your changes work as intended

Notes 📝

• Any notes/thoughts that the reviewers should know prior to reviewing the code?

I had to hardcode the url of the provider as http://127.0.0.1:3050 in the hello-world-docker/tests/main.test.ts file cause even if I use that value in the hardhat.config.ts file, getDefaultProvider replaces it with localhost which seems not to work in the CI job.