[Snyk] Security upgrade php from 7.1-fpm to 7.3.31-fpm

[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

• docker/php/Dockerfile

We recommend upgrading to php:7.3.31-fpm, as this image has only 81 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
	714	Double Free SNYK-DEBIAN10-CURL-466509	No Known Exploit
	714	Out-of-bounds Write SNYK-DEBIAN10-CURL-466510	No Known Exploit
	614	Information Exposure SNYK-DEBIAN10-CURL-573153	No Known Exploit
	614	Use After Free SNYK-DEBIAN10-CURL-608200	No Known Exploit
	714	Buffer Overflow SNYK-DEBIAN10-OPENSSL-1569403	No Known Exploit

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