[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 0 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
	400	Arbitrary Code Injection SNYK-ALPINE316-CURL-5422114	No Known Exploit
	500	Improper Authentication SNYK-ALPINE316-CURL-5422116	No Known Exploit
	500	Improper Authentication SNYK-ALPINE316-CURL-5422116	No Known Exploit
	400	Improper Authentication SNYK-ALPINE316-CURL-5422121	No Known Exploit
	400	Directory Traversal SNYK-ALPINE316-CURL-5422123	No Known Exploit

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