[openstreetmap/openstreetmap-website] Bump allowed ECMAScript version to 2022 (ES13) (PR #5421)

[Holger Jeromin]

missing 2023 in firefox
https://caniuse.com/mdn-javascript_builtins_weakmap_symbol_as_keys

Is a quite esotheric feature. But really needed stuff was not added in 2023. So fine with going with 2022.

> I'm assuming that there's going to a be a proportion of people using browsers that don't support ECMAScript 2022 since that's only a couple of years old.

This feels more critical as it is. The browsers are implementing features years before the spec is published.

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