Update php
Update php

Changes:

- https://github.com/docker-library/php/commit/a013f41: Update 8.1-rc to 8.1.3RC1
- https://github.com/docker-library/php/commit/0869d23: Update 8.0-rc to 8.0.16RC1
- https://github.com/docker-library/php/commit/c48d768: Merge pull request https://github.com/docker-library/php/pull/1250 from infosiftr/gpg-keys
- https://github.com/docker-library/php/commit/dc710cd: Move GPG keys into the template
- https://github.com/docker-library/php/commit/31bf204: Merge pull request https://github.com/docker-library/php/pull/1249 from infosiftr/opportunistic-rcs
- https://github.com/docker-library/php/commit/ad286b6: Add RCs opportunistically

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