[Snyk] Security upgrade django from 2.2.24 to 2.2.28

[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/base.txt

⚠️ Warning

requests 2.24.0 has requirement urllib3!=1.25.0,!=1.25.1,<1.26,>=1.21.1, but you have urllib3 1.26.5.
botocore 1.19.5 has requirement urllib3<1.26,>=1.25.4; python_version != "3.4", but you have urllib3 1.26.5.
awesome-slugify 1.6.5 has requirement Unidecode<0.05,>=0.04.14, but you have Unidecode 1.1.1.

Vulnerabilities that will be fixed

By pinning:

Severity	Priority Score (*)	Issue	Upgrade	Breaking Change	Exploit Maturity
	696/1000 Why? Recently disclosed, Has a fix available, CVSS 8.2	SQL Injection SNYK-PYTHON-DJANGO-2606966	django: 2.2.24 -> 2.2.28	No	No Known Exploit
	696/1000 Why? Recently disclosed, Has a fix available, CVSS 8.2	SQL Injection SNYK-PYTHON-DJANGO-2606969	django: 2.2.24 -> 2.2.28	No	No Known Exploit

(*) 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 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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