ci: Update node version on the site deploy action

[erickzanardo]

Description

The site deploy action is currently pinned to use node version 18.x: https://github.com/VeryGoodOpenSource/very_good_workflows/blob/main/.github/workflows/site_deploy.yaml#L29

Newer dependencies require node >= 20 as we can see on this failing workflow: #371

We should update the CI, make sure everything works, so we can keep the dependencies up to date.

Requirements

• All CI/CD checks are passing.
• There is no drop in the test coverage percentage.

Additional Context

No response

[Ansita20]

@erickzanardo Can you please assign me this issue?

[erickzanardo]

@erickzanardo Can you please assign me this issue?

You got it!