[Snyk] Fix for 3 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:
  • api/requirements.txt

⚠️ Warning

mongoengine 0.19.1 requires pymongo, which is not installed.
importlib-metadata 1.6.0 requires zipp, which is not installed.

Vulnerabilities that will be fixed

By pinning:

Severity	Priority Score (*)	Issue	Upgrade	Breaking Change	Exploit Maturity
	586/1000 Why? Proof of Concept exploit, Has a fix available, CVSS 5.3	Regular Expression Denial of Service (ReDoS) SNYK-PYTHON-JINJA2-1012994	jinja2: 2.11.2 -> 2.11.3	No	Proof of Concept
	479/1000 Why? Has a fix available, CVSS 5.3	Regular Expression Denial of Service (ReDoS) SNYK-PYTHON-MISTUNE-2940625	mistune: 0.8.4 -> 2.0.3	No	No Known Exploit
	876/1000 Why? Mature exploit, Has a fix available, CVSS 9.8	Arbitrary Code Execution SNYK-PYTHON-PYYAML-590151	pyyaml: 5.3.1 -> 5.4	No	Mature

(*) 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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Learn how to fix vulnerabilities with free interactive lessons:

🦉 Regular Expression Denial of Service (ReDoS) 🦉 Regular Expression Denial of Service (ReDoS) 🦉 Arbitrary Code Execution