Security upgrade php from 8.0.7-apache to 8.0.15-fpm

[cloudgeek7]

Changes included in this PR apache-php/app/Dockerfile I recommend upgrading to php:8.0.15-fpm, as this image has only 80 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 critical severity 714 Out-of-bounds Write SNYK-DEBIAN10-APACHE2-1301212 No Known Exploit critical severity 714 Out-of-bounds Write SNYK-DEBIAN10-APACHE2-1585736 No Known Exploit critical severity 714 Server-Side Request Forgery (SSRF) SNYK-DEBIAN10-APACHE2-1585740 No Known Exploit critical severity 714 Out-of-bounds Write SNYK-DEBIAN10-APACHE2-2322058 No Known Exploit critical severity 714 Buffer Overflow SNYK-DEBIAN10-OPENSSL-1569403 No Known Exploit