[Snyk] Security upgrade php from 7.0-apache to 7.3.31-apache

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 Merge Request

• vendor/Dockerfile/PHP.Dockerfile

We recommend upgrading to php:7.3.31-apache, as this image has only 196 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
	929	Server-Side Request Forgery (SSRF) SNYK-DEBIAN9-APACHE2-1585735	Mature
	714	HTTP Request Smuggling SNYK-DEBIAN9-APACHE2-2422334	No Known Exploit
	714	Out-of-bounds Write SNYK-DEBIAN9-APACHE2-2422342	No Known Exploit
	714	Integer Overflow or Wraparound SNYK-DEBIAN9-APACHE2-2422343	No Known Exploit
	829	Use After Free SNYK-DEBIAN9-APACHE2-342127	Mature

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🦉 Server-Side Request Forgery (SSRF)