go.toolchain.next.rev: bump 'next' to Go 1.27.0

Updates #20220

Change-Id: Ic37fd49e2d4e6198965fc549b2efac04579f99c8
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
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Internal Server Error - Gitea: Git with a cup of tea
500 Internal Server Error

Gitea Version: 1.28.0+dev-477-g8b6ad49a5f