[Snyk] Security upgrade pillow from 6.2.2 to 8.1.1

[vndee]

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

As this is a private repository, Snyk-bot does not have access. Therefore, this PR has been created automatically, but appears to have been created by a real user.

Changes included in this PR

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

⚠️ Warning

``` importlib-metadata 1.5.0 requires zipp, which is not installed. ```

Vulnerabilities that will be fixed

By pinning:

Severity	Priority Score (*)	Issue	Upgrade	Breaking Change	Exploit Maturity
	661/1000 Why? Recently disclosed, Has a fix available, CVSS 7.5	Out-of-bounds Read SNYK-PYTHON-PILLOW-1080635	pillow: 6.2.2 -> 8.1.1	No	No Known Exploit
	661/1000 Why? Recently disclosed, Has a fix available, CVSS 7.5	Regular Expression Denial of Service (ReDoS) SNYK-PYTHON-PILLOW-1080654	pillow: 6.2.2 -> 8.1.1	No	No Known Exploit
	726/1000 Why? Recently disclosed, Has a fix available, CVSS 8.8	Heap-based Buffer Overflow SNYK-PYTHON-PILLOW-1082329	pillow: 6.2.2 -> 8.1.1	No	No Known Exploit
	661/1000 Why? Recently disclosed, Has a fix available, CVSS 7.5	Insufficient Validation SNYK-PYTHON-PILLOW-1082750	pillow: 6.2.2 -> 8.1.1	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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