[Snyk] Security upgrade mysql from 5.7.35 to 5

[meetmatt]

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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

• infra/dev/mysql/Dockerfile

We recommend upgrading to mysql:5, as this image has only 84 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
	400	Information Exposure SNYK-DEBIAN10-GCC8-347558	No Known Exploit
	400	Integer Overflow or Wraparound SNYK-DEBIAN10-GMP-1920939	No Known Exploit
	514	CVE-2021-4160 SNYK-DEBIAN10-OPENSSL-2388381	No Known Exploit
	733	Loop with Unreachable Exit Condition ('Infinite Loop') SNYK-DEBIAN10-OPENSSL-2426310	No Known Exploit
	733	Loop with Unreachable Exit Condition ('Infinite Loop') SNYK-DEBIAN10-OPENSSL-2426310	No Known Exploit

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