feat: update to node 20

yoannfleurydev commented 4 months ago

as node 18 is only in maintenance mode and node 20 is the active one, I suggest to go for 20. node 22 has been released some days ago, but it is too early to go for it at the moment in my opinion

Checklist

[x] I performed a self review of my code
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[ ] I tested the feature or fix on my local environment
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[ ] If applicable, I updated the translations for english and french files
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[x] If applicable, I updated the README.md
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