[Snyk] Security upgrade redis from 2.10.5 to 4.3.6

[snyk-bot]

Snyk has created this PR to fix one or more vulnerable packages in the `pip` dependencies of this project.

Changes included in this PR

• Changes to the following files to upgrade the vulnerable dependencies to a fixed version:
  • tools/requirements.txt

Vulnerabilities that will be fixed

By pinning:

Severity	Priority Score (*)	Issue	Upgrade	Breaking Change	Exploit Maturity
	578/1000 Why? Proof of Concept exploit, Recently disclosed, Has a fix available, CVSS 3.7	Exposure of Data Element to Wrong Session SNYK-PYTHON-REDIS-5291195	redis: 2.10.5 -> 4.3.6	No	Proof of Concept

(*) Note that the real score may have changed since the PR was raised.

Some vulnerabilities couldn't be fully fixed and so Snyk will still find them when the project is tested again. This may be because the vulnerability existed within more than one direct dependency, but not all of the affected dependencies could be upgraded.

Check the changes in this PR to ensure they won't cause issues with your project.

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[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (936e454) 89.19% compared to head (89de83e) 89.19%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1447   +/-   ##
=======================================
  Coverage   89.19%   89.19%           
=======================================
  Files          34       34           
  Lines        5599     5599           
=======================================
  Hits         4994     4994           
  Misses        605      605           

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