Update Packer to latest version

[AdarshK15]

Update Packer to latest version in test image.

Submission Checklist

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• Fork your PR branch from the Toolkit "develop" branch (not main)
• Test all changes with pre-commit in a local branch #
• Confirm that "make tests" passes all tests
• Add or modify unit tests to cover code changes
• Ensure that unit test coverage remains above 80%
• Update all applicable documentation
• Follow Cluster Toolkit Contribution guidelines #

[gemini-code-assist]

Summary of Changes

Hello, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request updates the Packer version used within the test image environment to ensure consistency and leverage the latest features and security patches. The changes span the Docker configuration, the dependency management script, and the associated documentation.

Highlights

• Packer Version Update: Updated the Packer version from 1.8.6 to 1.15.3 in the Dockerfile and from 1.15.0 to 1.15.3 in the dependency update script.
• Documentation Update: Updated the README.md to reflect the new default Packer version of 1.15.3.

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[gemini-code-assist]

Code Review

This pull request updates the Packer version to 1.15.3 in the Dockerfile, README, and dependency update script. The reviewer correctly notes that the tools/update-dependencies.sh script must be run to regenerate the checksums file pkg/dependencies/checksums_generated.go so that the Go CLI uses the correct expected checksums.