Travis can't install PHP 8.3

Deployment
1

I’m using this .travis.yml configuration:

os: linux
dist: focal
language: php
php: '8.3'

and I received the error:

$ phpenv global 8.3 2>/dev/null
8.3 is not pre-installed; installing
Downloading archive: https://storage.googleapis.com/travis-ci-language-archives/php/binaries/ubuntu/14.04/x86_64/php-8.3.tar.bz2
$ curl -sSf --retry 5 -o archive.tar.bz2 $archive_url && tar xjf archive.tar.bz2 --directory /
curl: (22) The requested URL returned error: 404 Not Found
$ phpenv global 8.3
rbenv: version `8.3' not installed
The command "phpenv global 8.3" failed and exited with 1 during .
2

ubuntu 14.04 looks deprecated now

3

I’m using Focal distr in my .travis.yml, but Travis tries to load Ubuntu 14.04 (instead of 20.04).