[Snyk] Security upgrade pillow from 4.3.0 to 9.0.0

[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

⚠️ Warning

``` requests 2.21.0 has requirement urllib3<1.25,>=1.21.1, but you have urllib3 1.26.5. ```

Vulnerabilities that will be fixed

By pinning:

Severity	Priority Score (*)	Issue	Upgrade	Breaking Change	Exploit Maturity
	581/1000 Why? Recently disclosed, Has a fix available, CVSS 5.9	Denial of Service (DoS) SNYK-PYTHON-PILLOW-2329135	pillow: 4.3.0 -> 9.0.0	No	No Known Exploit
	776/1000 Why? Recently disclosed, Has a fix available, CVSS 9.8	Arbitrary Code Execution SNYK-PYTHON-PILLOW-2331901	pillow: 4.3.0 -> 9.0.0	No	No Known Exploit
	611/1000 Why? Recently disclosed, Has a fix available, CVSS 6.5	Buffer Over-read SNYK-PYTHON-PILLOW-2331905	pillow: 4.3.0 -> 9.0.0	No	No Known Exploit
	551/1000 Why? Recently disclosed, Has a fix available, CVSS 5.3	Improper Initialization SNYK-PYTHON-PILLOW-2331907	pillow: 4.3.0 -> 9.0.0	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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