[Snyk] Security upgrade php from 8.0-fpm-alpine to 8.1-fpm-alpine

[sbalthazor]

This PR was automatically created by Snyk using the credentials of a real user.

Keeping your Docker base image up-to-date means you’ll benefit from security fixes in the latest version of your chosen image.

Changes included in this PR

• images/php-fpm/Dockerfile

We recommend upgrading to php:8.1-fpm-alpine, as this image has only 2 known vulnerabilities. To do this, merge this pull request, then verify your application still works as expected.

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