Update php Docker tag

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
php	final	minor	7.2-fpm-alpine -> 7.4-fpm-alpine
php	final	minor	7.1.4-fpm-alpine -> 7.4.33-fpm-alpine
php	final	minor	7.0-fpm-alpine -> 7.4-fpm-alpine

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