v1.76.6-sunos

Commits

• fix spurious warning about DERP home region '0' (Brad Fitzpatrick)
• b73831b: net/sockstats: prevent crash in setNetMon (tailscale#13985) (Andrea Gottardo)
• 5280738: net/netcheck: ensure prior preferred DERP is always in netchecks (James Tucker) #13996
• 0472936: wgengine/magicsock: log home DERP changes with latency (Tim Walters)
• 666c961: VERSION.txt: this is v1.76.4 (Andrea Gottardo)
• dda4603: VERSION.txt: this is v1.76.5 (Andrea Gottardo)
• 1edcf9d: VERSION.txt: this is v1.76.6 (Jonathan Nobels)
• 0047fcf: Merge tag 'v1.76.6' into sunos-1.76 (Nahum Shalman)