[Snyk] Security upgrade php from 8.0-fpm-alpine to 8.1.18-fpm-alpine

[snyk-bot]

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:8.1.18-fpm-alpine, as this image has only 5 known vulnerabilities. To do this, merge this pull request, then verify your application still works as expected.

Some of the most important vulnerabilities in your base image include:

Severity	Priority Score / 1000	Issue	Exploit Maturity
	571	CVE-2023-28322 SNYK-ALPINE316-CURL-5561314	No Known Exploit
	571	CVE-2023-28322 SNYK-ALPINE316-CURL-5561314	No Known Exploit
	471	Use After Free SNYK-ALPINE316-CURL-5561317	No Known Exploit
	471	Use After Free SNYK-ALPINE316-CURL-5561317	No Known Exploit
	471	Improper Certificate Validation SNYK-ALPINE316-CURL-5561318	No Known Exploit

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