Fix required boolean (invalid) with required array

[richfab]

What is it about?

The JSON schema used for GBFS feed validation was using an invalid property. The property required must take an array (reference) but it was taking a boolean.

The GBFS JSON schema was fixed in Replace required with boolean (invalid) to array.

This PR updates the schema in gbfs-validator.

Why does it matter?

A provider (TIER) is trying to update their GBFS feeds to v3.0, which is great! Unfortunately our validator is not so helpful now because it says the feed is valid although it's not. This PR will help the provider fix their feed.

Screenshots

https://data-sharing.tier-services.io/tier_paris/gbfs/3.0

Before	After
The validation report says gbfs.json is valid although it is not.	The validation report correctly shows gbfs.json as invalid due to the extra en level.

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