chore(deps): update php:7.4-fpm-alpine docker digest to a4abb0a

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
php	final	digest	e4e0e5e -> a4abb0a
php	stage	digest	e4e0e5e -> a4abb0a

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This PR was configured for branch automerge, however this is not possible so it has been raised as a PR instead.

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[github-actions[bot]]

:tada: This PR is included in version 5.1.9 :tada:

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