[8.10](backport #36549) x-pack/packetbeat: bump npcap version to v1.76

[mergify]

This is an automatic backport of pull request #36549 done by Mergify.

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[cmacknz]

Backporting to 8.10 as it is blocking #36860, which upgrades to Go 1.20.10 in case there is a future 8.10.x release.