rec-5.1.x: Backport 14862 - builder: remove ubuntu lunar+mantic as they are EOL #14872
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Short description
Backport of #14862 to rel/rel/rec-5.1.x
Test: https://github.com/romeroalx/pdns/actions/runs/12004826654
Fixes: https://github.com/PowerDNS/pdns/actions/runs/12002070611
Checklist
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