go.toolchain.rev: bump from Go 1.23.1 to Go 1.23.3

Updates #14100

Change-Id: I57f9d4260be15ce1daebe4a9782910aba3fb9dc9
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