[Snyk] Security upgrade python from 3.7.10 to 3.7

[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

• sample-app/redisearch-python-rest/Dockerfile

We recommend upgrading to python:3.7, as this image has only 228 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
	667	Improper Encoding or Escaping of Output SNYK-DEBIAN10-EXPAT-2403513	No Known Exploit
	667	Improper Encoding or Escaping of Output SNYK-DEBIAN10-EXPAT-2403513	No Known Exploit
	667	Exposure of Resource to Wrong Sphere SNYK-DEBIAN10-EXPAT-2403518	No Known Exploit
	667	Exposure of Resource to Wrong Sphere SNYK-DEBIAN10-EXPAT-2403518	No Known Exploit
	714	Buffer Overflow SNYK-DEBIAN10-OPENSSL-1569403	No Known Exploit

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