chore(deps): update dependency nethserver/nethsecurity-ui to v2.21.0

[renovate]

This PR contains the following updates:

Package	Update	Change
NethServer/nethsecurity-ui	minor	2.20.1 → 2.21.0

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Release Notes

NethServer/nethsecurity-ui (NethServer/nethsecurity-ui)

v2.21.0

Compare Source

Features

• added alerts in dashboard, replaced dpi status (4a53cb5)
• expose metrics from Victoria (#​754) (5ba4d4e)
• firewall-logging: unify traffic logging option visualization (#​756) (37cc708)
• firewall: added NOTRACK for firewall rules (#​767) (7e751b7)
• ipsec: convert DPD to combobox (#​768) (f2d5173)
• threat shield dns: use staged commits (#​766) (5c30b4c)

Bug Fixes

• dashboard: removed button from alert card (ff8fc76)
• firewall: adding validation when creating NOTRACK rule (8de2706)
• flows: fixed configure drawer empty in some situations (7c7f487)
• flows: updated banner of real time monitor few apps (6108c88)
• updated required api version (4af3408)

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