[Snyk] Security upgrade php from 7.3-alpine to 7-alpine

[sanketsudake]

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

• php7/builder/Dockerfile

We recommend upgrading to php:7-alpine, as this image has only 35 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	Incorrect Default Permissions SNYK-ALPINE315-CURL-2938004	No Known Exploit
	714	Exposure of Resource to Wrong Sphere SNYK-ALPINE315-CURL-3063708	No Known Exploit
	714	Out-of-bounds Write SNYK-ALPINE315-CURL-5958915	No Known Exploit
	829	Resource Exhaustion SNYK-ALPINE315-NGHTTP2-5964211	Mature
	714	Out-of-bounds Write SNYK-ALPINE315-ZLIB-2976173	No Known Exploit

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🦉 Resource Exhaustion 🦉 Incorrect Default Permissions