go.toolchain.rev: bump for Go 1.18.4 + runtime timer spin

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See https://github.com/tailscale/go/pull/32

Updates #4760
Updates #5030?
Updates #4891?

Change-Id: I066aafddc09fade30a5f3fdee23e6bd200eda9fa
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>

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