.github: build gocross using regular GOPROXY settings

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This `go get` action has been running very slowly, and I'm pretty sure
it's because we're building gocross on the first `./tool/go` run, and
because we've set `GOPROXY=direct`, it's going directly to GitHub to
fetch all of the gocross dependencies.

Updates #cleanup

Signed-off-by: Will Norris <will@tailscale.com>

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