go.toolchain.rev: bump to Go 1.22.2

Update tailscale/corp#18893

Change-Id: I4c04f5153ad43429d7f510c9ac2194c3b2fbc6c1
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