[client] Tighten allowed domains for dns forwarder

[lixmal]

Describe your changes

Issue ticket number and link

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Checklist

• [x] Is it a bug fix
• [ ] Is a typo/documentation fix
• [x] Is a feature enhancement
• [ ] It is a refactor
• [x] Created tests that fail without the change (if possible)
• [ ] Extended the README / documentation, if necessary

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[sonarqubecloud[bot]]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

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