Update the krb5 image in the integration tests

[siegfriedweber]

Description

Update the krb5 image in the integration tests

The krb5 version was upgraded from 1.18.2 to 1.21.1 in stackabletech/docker-images#627. As the image with version 1.18.2 is not built anymore, it must be replaced in all integration tests.

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. Integration tests passed (for non trivial changes)

Reviewer

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1. Code contains useful comments
2. Code contains useful logging statements
3. (Integration-)Test cases added
4. Documentation added or updated. Follows the style guide.
5. Changelog updated
6. 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

[razvan]

thanks