Revert secret-scan to ubuntu-24.04

[pofl]

Type of Change

• Bugfix
• Enhancement / new feature
• Refactoring
• Documentation

Description

The trufflehog action doesn't work in ubuntu-slim because it uses the Docker socket.

Upgrading the workflow to latest version fails in Action. E.g. here:

failed to connect to the docker API at unix:///var/run/docker.sock; check if the path is correct and if the daemon is running: dial unix /var/run/docker.sock: connect: no such file or directory

I don't know which label to pick. Is this a major version bump? Idk.

Checklist

• Add relevant labels (for example type of change or patch/minor/major)
• Make sure not to introduce some mistakes
• Update documentation
• Review the Contributing Guideline and sign CLA
• Reference relevant issue(s) and close them after merging