[Snyk] Security upgrade python from 3-alpine to 3.13.0a1-alpine

[momo-tong]

Snyk has created this PR to fix 3 vulnerabilities in the dockerfile dependencies of this project.

Keeping your Docker base image up-to-date means you’ll benefit from security fixes in the latest version of your chosen image.

Snyk changed the following file(s):

• python-blueplanet/app/Dockerfile.mustache

We recommend upgrading to python:3.13.0a1-alpine, as this image has only 18 known vulnerabilities. To do this, merge this pull request, then verify your application still works as expected.

Vulnerabilities that will be fixed with an upgrade:

	Issue	Score
	Integer Overflow or Wraparound SNYK-ALPINE320-EXPAT-7908298	786
	Integer Overflow or Wraparound SNYK-ALPINE320-EXPAT-7908299	786
	XML External Entity (XXE) Injection SNYK-ALPINE320-EXPAT-7908300	786

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[!IMPORTANT]

• Check the changes in this PR to ensure they won't cause issues with your project.
• Max score is 1000. Note that the real score may have changed since the PR was raised.
• This PR was automatically created by Snyk using the credentials of a real user.

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🦉 XML External Entity (XXE) Injection