[Snyk] Security upgrade php from 7.2-fpm to 7.4.28-fpm

[jsdecena]

This PR was automatically created by Snyk using the credentials of a real user.

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

• Dockerfile

We recommend upgrading to php:7.4.28-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
	614	Use After Free SNYK-DEBIAN10-CURL-608200	No Known Exploit
	614	Integer Overflow or Wraparound SNYK-DEBIAN10-OPENSSL-1075326	No Known Exploit
	714	Buffer Overflow SNYK-DEBIAN10-OPENSSL-1569403	No Known Exploit
	614	Out-of-bounds Read SNYK-DEBIAN10-OPENSSL-1569406	No Known Exploit
	614	Loop with Unreachable Exit Condition ('Infinite Loop') SNYK-DEBIAN10-OPENSSL-2426310	No Known Exploit

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