go.toolchain.rev: bump Go toolchain for net pkg resolv.conf fix

Updates tailscale/corp#22206

Change-Id: I9d995d408d4be3fd552a0d6e12bf79db8461d802
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
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Internal Server Error - Gitea: Git with a cup of tea
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Gitea Version: 1.28.0+dev-477-g8b6ad49a5f