Update php
Update php

Changes:

- https://github.com/docker-library/php/commit/545a73c: Update comment format to match our other inline comments
- https://github.com/docker-library/php/commit/b248f8f: Merge pull request https://github.com/docker-library/php/pull/816 from lcobucci/define-stopsignal-for-fpm
- https://github.com/docker-library/php/commit/e21810a: Perform graceful stops on PHP-FPM

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