[Packetbeat] Update Npcap version to v1.78

[kgeller]

We are currently bundling Npcap with Packetbeat, and the Network Packet Capture integration with version 1.76. Since that update, version 1.78 has been released that fixes memory leaks in v1.76 & 1.77.

https://github.com/nmap/npcap/blob/master/CHANGELOG.md#npcap-178-2023-10-18

• update cross builder images — (see bump npcap version to 1.76 golang-crossbuild#315 for previous process) — bump npcap version to 1.78 golang-crossbuild#360
• update version in x-pack/packetbeat/magefile.go (see x-pack/packetbeat: bump npcap version to v1.71 #33172 for pattern, copyright dates are now 2013-2023) — x-pack/packetbeat: bump npcap version to v1.78 #37370

[elasticmachine]

Pinging @elastic/security-external-integrations (Team:Security-External Integrations)

[efd6]

I doubt we will get this fix into v8.11.2.

[ebeahan]

@efd6 I see elastic/golang-crossbuild#360 was merged. Any other necessary steps to take?

[efd6]

The issue was elastic/golang-crossbuild#361. That is now merged. The second part can now be done.

[cmacknz]

I believe this is (or something related to this) is blocking the upgrade to Go 1.20.12 in #37350 since it is failing trying to pull docker.elastic.co/observability-ci/golang-crossbuild:1.20.12-npcap-1.76-debian9

[efd6]

@cmacknz There is now a PR to change the npcap version and it should be asking for 1.78.

[efd6]

Note that that image should be available anyway, so I'm not sure why that would fail.