go.mod: bump tailscale/wireguard-go for Solaris/Illumos

Updates #14565

Change-Id: Ifb88ab2ee1997c00c3d4316be04f6f4cc71b2cd3
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