[davidspek]

Fixes Issue

This PR updates the Dockerfile so that it uses Python 3.12 base images. Python 3.10 is set to be EOL very soon and since the packages are already built for 3.12 I'd say it makes sense to update the container images to this version as well.

Changes proposed

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[zeevmoney]

Thank you for this.

The images have been on Python 3.12 since #993. 0.10 moves them on again, to Python 3.14 on a new base image with a newer pygit2, so this change is no longer needed. The cedar-agent version bump in here is tracked separately.

Closing, and thanks for helping keep the images current.