Renovate Update php Docker tag to v8.4.2

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
php	final	minor	8.1.18-fpm-alpine -> 8.4.2-fpm-alpine
php	final	minor	8.1.29-fpm-alpine3.20 -> 8.4.2-fpm-alpine3.20

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[renovate]

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