chore(renovate): lock docker to 28.1.1 for Ubuntu 20.04

[janishorsts]

The latest supported versions...

root@buildkitsandbox:/# apt list -a docker-ce
Listing... Done
docker-ce/focal 5:28.1.1-1~ubuntu.20.04~focal amd64
docker-ce/focal 5:28.1.0-1~ubuntu.20.04~focal amd64
docker-ce/focal 5:28.0.4-1~ubuntu.20.04~focal amd64
...

[gemini-code-assist]

Summary of Changes

Hello @janishorsts, 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 Renovate configuration to enforce a specific Docker version for builds targeting Ubuntu 20.04. The change aims to ensure compatibility and stability by explicitly locking the docker/docker package to version 28.1.1 for environments using the os/ubuntu-20.04/Earthfile, aligning with the latest supported version for that Ubuntu release.

Highlights

• Dependency Version Locking: Introduced a new Renovate rule to explicitly lock the docker/docker package to version 28.1.1 for builds associated with Ubuntu 20.04, specifically those using the os/ubuntu-20.04/Earthfile.

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[gemini-code-assist]

Code Review

The pull request adds a new Renovate rule to lock the version of docker/docker to 28.1.1 for Ubuntu 20.04. The change is made in .github/renovate.json5 and is consistent with existing rules for other Ubuntu versions. The new rule correctly specifies the file path and package name, and pins the version as intended. The change is clear, correct, and I have no suggestions for improvement.