[Snyk] Fix for 7 vulnerabilities

[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:
  • requirements.txt

Vulnerabilities that will be fixed

By pinning:

Severity	Issue	Upgrade	Breaking Change	Exploit Maturity
	Open Redirect SNYK-PYTHON-AIOHTTP-1079232	aiohttp: 3.6.3 -> 3.7.4	No	No Known Exploit
	Deserialization of Untrusted Data SNYK-PYTHON-NETWORKX-1062709	networkx: 2.5.1 -> 2.6	No	No Known Exploit
	Regular Expression Denial of Service (ReDoS) SNYK-PYTHON-NLTK-1660190	nltk: 3.6 -> 3.6.4	No	No Known Exploit
	Arbitrary File Write via Archive Extraction (Zip Slip) SNYK-PYTHON-RASA-1766497	rasa: 2.1.2 -> 2.8.10	No	No Known Exploit
	Regular Expression Denial of Service (ReDoS) SNYK-PYTHON-SCIKITLEARN-1079100	scikit-learn: 0.23.2 -> 0.24.2	No	Proof of Concept
	Timing Attack SNYK-PYTHON-WEBSOCKETS-1297182	websockets: 8.1 -> 10.0	No	No Known Exploit
	Denial of Service (DoS) SNYK-PYTHON-WEBSOCKETS-1582792	websockets: 8.1 -> 10.0	No	No Known Exploit

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 effected dependencies could be upgraded.

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

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