downgrade to kirby v3

vendor/symfony/polyfill-intl-normalizer/README.md

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+Symfony Polyfill / Intl: Normalizer
+===================================
+
+This component provides a fallback implementation for the
+[`Normalizer`](https://php.net/Normalizer) class provided
+by the [Intl](https://php.net/intl) extension.
+
+More information can be found in the
+[main Polyfill README](https://github.com/symfony/polyfill/blob/main/README.md).
+
+License
+=======
+
+This library is released under the [MIT license](LICENSE).