[Snyk] Security upgrade python from 3.5-stretch to 3.7.11-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

• tensorflow/tools/ci_build/Dockerfile.micro

We recommend upgrading to python:3.7.11-stretch, as this image has only 572 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-DEBIAN9-LIBXML2-1277342	No Known Exploit
	614	Use After Free SNYK-DEBIAN9-LIBXML2-1277344	No Known Exploit
	614	Integer Overflow or Wraparound SNYK-DEBIAN9-OPENSSL-1075328	No Known Exploit
	614	Out-of-bounds Read SNYK-DEBIAN9-OPENSSL-1569399	No Known Exploit
	714	Buffer Overflow SNYK-DEBIAN9-PYTHON35-1063181	No Known Exploit

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