Update test and doc versions

[maltesander]

Description

• Add: 3.4.1
• Mark 3.4.0 as deprecated

Part of stackabletech/docker-images#1018

Definition of Done Checklist

• Not all of these items are applicable to all PRs, the author should update this template to only leave the boxes in that are relevant
• Please make sure all these things are done and tick the boxes

Author

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1. Changes are OpenShift compatible
2. CRD changes approved
3. CRD documentation for all fields, following the style guide.
4. Helm chart can be installed and deployed operator works
5. Integration tests passed (for non trivial changes)
6. Changes need to be "offline" compatible

Reviewer

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1. (Integration-)Test cases added : dimensions updated
2. Changelog updated
3. Cargo.toml only contains references to git tags (not specific commits or branches)

Acceptance

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1. Feature Tracker has been updated
2. Proper release label has been added
3. Roadmap has been updated

[Techassi]

Also, I would avoid the fixes keyword in the PR description, because that will auto-close the tracking issue. And there are most likely open tasks which are not done yet.

I will edit the description accordingly.

[adwk67]

thanks! - LGTM