Change Docker base image to version 29

[brendandburns]

Updated Docker base image from 'docker:stable' to 'docker:29'.

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Pull request overview

This pull request updates the Docker base image in the CRD model generation Dockerfile from the floating docker:stable tag to a pinned version docker:29. This change improves build reproducibility and helps prevent issues related to Docker API version mismatches. The Dockerfile is used to create a container that orchestrates CRD Java model generation using kind, kubectl, and Docker-in-Docker.

Changes:

• Updated Docker base image from docker:stable to docker:29 for better version control and stability

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