[Snyk] Security upgrade python from 3.11.1 to 3.12.5

[giorgiosld]

Snyk has created this PR to fix 2 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):

• thumbnailer/Dockerfile

We recommend upgrading to python:3.12.5, as this image has only 197 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
	Out-of-bounds Write SNYK-DEBIAN11-LIBWEBP-5893094	829
	Out-of-bounds Write SNYK-DEBIAN11-LIBWEBP-5893094	829
	Out-of-bounds Write SNYK-DEBIAN11-LIBWEBP-5893094	829
	Out-of-bounds Write SNYK-DEBIAN11-LIBWEBP-5893094	829
	CVE-2023-44487 SNYK-DEBIAN11-NGHTTP2-5953384	829

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• 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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