Update php
Update php

Changes:

- https://github.com/docker-library/php/commit/a7a32c7: Update to 7.3.20
- https://github.com/docker-library/php/commit/25b211a: Update to 7.2.32
- https://github.com/docker-library/php/commit/86c8ec4: Update to 7.4.8
- https://github.com/docker-library/php/commit/7bdd5e8: Merge pull request https://github.com/docker-library/php/pull/1034 from carusogabriel/php8/alpha2
- https://github.com/docker-library/php/commit/b1677e7: Update to 8.0.0alpha2
- https://github.com/docker-library/php/commit/8768734: Update to PHP 8.0.0alpha2

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