netmetr: update to version 1.5.4
Brings changes suggested in issues turris/netmetr-client#7 (closed) and turris/netmetr-client#8 (closed) and merged in turris/netmetr-client!7 (merged)
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Brings changes suggested in issues turris/netmetr-client#7 (closed) and turris/netmetr-client#8 (closed) and merged in turris/netmetr-client!7 (merged)