Issue #3623801 : Improve compatibility - require PHP 8.1+, drop Drupal 9.3...

Domagoj Potkocrequested to merge
issue/fastly-3623801:3623801-improve-compatibility into 4.0.x-dev

Issue #3623801 : Improve compatibility - require PHP 8.1+, drop Drupal 9.3 support and clean up recv.vcl cookie handling

Closes #3623801

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