Updated all the node-version to 18 in the workflow directory

[warlegend24]

Pull Request

Related issue

Fixes #1119

What does this PR do?

• Updating the node-version : 18 in the following files in the .github/workflows/ directory:-

1. .github/workflows/meilisearch-prototype-tests.yml
2. .github/workflows/pre-release-tests.yml
3. .github/workflows/publish.yml
4. .github/workflows/tests.yml

PR checklist

Please check if your PR fulfills the following requirements:

• Does this PR fix an existing issue, or have you listed the changes applied in the PR description (and why they are needed)?
• Have you read the contributing guidelines?
• Have you made sure that the title is accurate and descriptive of the changes?

Thank you so much for contributing to Meilisearch!

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[bidoubiwa]

closed in favor of #1122

Thanks for the contribution though, even if it was not merged