test: Fix k8s tests by modifying name for k8s bucket

[adeatcu-ionos]

What does this fix or implement?

Fix https://github.com/ionos-cloud/terraform-provider-ionoscloud/actions/runs/8230155657

Checklist

• [x] PR name added as appropriate (e.g. feat:/fix:/doc:/test:/refactor:)
• [ ] Tests added or updated
• [ ] Documentation updated
• [ ] Changelog updated and version incremented (label: upcoming release)
• [ ] Github Issue linked if any
• [ ] Jira task updated

[sonarcloud[bot]]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
No data about Coverage
0.0% Duplication on New Code

See analysis details on SonarCloud