[Snyk] Security upgrade pillow from 8.2.0 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

jupyter 1.0.0 requires jupyter-console, which is not installed.
ipython 5.10.0 has requirement prompt-toolkit<2.0.0,>=1.0.4, but you have prompt-toolkit 2.0.6.
imageio 2.6.1 requires pillow, which is not installed.
google-auth 1.5.1 requires rsa, which is not installed.
datashader 0.8.0 requires xarray, which is not installed.
datashader 0.8.0 requires scipy, which is not installed.
datashader 0.8.0 requires pillow, which is not installed.
datashader 0.8.0 requires scikit-image, which is not installed.
datashader 0.8.0 requires numba, which is not installed.
bokeh 1.3.4 requires pillow, which is not installed.

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: 8.2.0 -> 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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