[Bug]: fix(vacuum): correctly state that vacuum was released in 0.5.6 not 0.6 (fixes #2956)

[Benzhaomin]

Description of changes

Change a single warning to correctly state the version where vacuum was introduced.

Test plan

No test needed this is only a string in a warning that is not tested.

Documentation Changes

Docstring updated, no change needed in other docs.

[github-actions]

Reviewer Checklist

Please leverage this checklist to ensure your code review is thorough before approving

Testing, Bugs, Errors, Logs, Documentation

• Can you think of any use case in which the code does not behave as intended? Have they been tested?
• Can you think of any inputs or external events that could break the code? Is user input validated and safe? Have they been tested?
• If appropriate, are there adequate property based tests?
• If appropriate, are there adequate unit tests?
• Should any logging, debugging, tracing information be added or removed?
• Are error messages user-friendly?
• Have all documentation changes needed been made?
• Have all non-obvious changes been commented?

System Compatibility

• Are there any potential impacts on other parts of the system or backward compatibility?
• Does this change intersect with any items on our roadmap, and if so, is there a plan for fitting them together?

Quality

• Is this code of a unexpectedly high quality (Readability, Modularity, Intuitiveness)

[tazarov]

@Benzhaomin, you need to make some sort of a change on your code and push to make the PR title check pass. I suggest you rebase off the latest main and force push.