[Snyk] Security upgrade php from 7.1-apache-stretch to 7.3.29-apache-stretch

[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

• examples/php-mysql-example/Dockerfile

We recommend upgrading to php:7.3.29-apache-stretch, as this image has only 345 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
	786	HTTP Request Smuggling SNYK-DEBIAN9-APACHE2-2422334	No Known Exploit
	786	Out-of-bounds Write SNYK-DEBIAN9-APACHE2-2422342	No Known Exploit
	786	Integer Overflow or Wraparound SNYK-DEBIAN9-APACHE2-2422343	No Known Exploit
	714	Out-of-bounds Read SNYK-DEBIAN9-LIBXML2-429367	No Known Exploit
	686	Loop with Unreachable Exit Condition ('Infinite Loop') SNYK-DEBIAN9-OPENSSL-2426305	No Known Exploit

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