[Snyk] Security upgrade python from 3.7.3 to 3.10.0a7

[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:3.10.0a7, as this image has only 368 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	Credentials Management SNYK-DEBIAN9-PYTHON35-340072	No Known Exploit
	714	Directory Traversal SNYK-DEBIAN9-PYTHON35-453739	No Known Exploit
	714	Improper Input Validation SNYK-DEBIAN9-PYTHON35-461194	No Known Exploit
	714	Improper Input Validation SNYK-DEBIAN9-PYTHON35-584364	No Known Exploit
	714	Credentials Management SNYK-DEBIAN9-PYTHON35-584435	No Known Exploit

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