net: builders failing `TestLookupDotsWithRemoteSource` and `TestLookupGoogleSRV` due to missing host for `_xmpp-server._tcp.google.com` [1.19 backport]

[gopherbot]

@mknyszek requested issue #56707 to be considered for backport to the next 1.19 minor release.

@gopherbot Please backport this issue to Go 1.18 and Go 1.19. It's causing widespread builder failures.

[gopherbot]

Change https://go.dev/cl/449506 mentions this issue: [release-branch.go1.19] net: disable TestLookupDotsWithRemoteSource and TestLookupGoogleSRV

[gopherbot]

Closed by merging c653979 to release-branch.go1.19.