go.toolchain.rev: bump Go toolchain

For tailscale/go#108 so we can depend on it in
other repos. (This repo can't yet use it; we permit building
tailscale/tailscale with the latest stock Go release) But that will be
in Go 1.24. We're just impatient elsewhere and would like it in the
control plane code earlier.

Updates tailscale/corp#25406

Change-Id: I53ff367318365c465cbd02cea387c8ff1eb49fab
Signed-off-by: Brad Fitzpatrick <[email protected]>

Author: bradfitz

go.toolchain.rev

@@ -1 +1 @@
-96578f73d04e1a231fa2a495ad3fa97747785bc6
+e005697288a8d2fadc87bb7c3e2c74778d08554a