Use go.dev/dl for downloading Go

[xmudrii]

The original URL is throwing HTTP error 401:

I1202 13:25:00.921222       1 install.go:92] Installing go 1.24.9 to /go-workspace/go-1.24.9
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
  0   298    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0
curl: (22) The requested URL returned error: 403

gzip: stdin: unexpected end of file
tar: Child returned status 1
tar: Error is not recoverable: exiting now
E1202 13:25:01.100987       1 publisher.go:460] command "/bin/bash -c curl -SLf https://storage.googleapis.com/golang/go1.24.9.linux-amd64.tar.gz | tar -xz --strip 1 -C /go-workspace/go-tmp-265313062" failed: exit status 2
I1202 13:25:01.110173       1 main.go:185] Failed to run publisher: command "/bin/bash -c curl -SLf https://storage.googleapis.com/golang/go1.24.9.linux-amd64.tar.gz | tar -xz --strip 1 -C /go-workspace/go-tmp-265313062" failed: exit status 2

I don't know if Google changed anything, but go.dev/dl is the official URL on their website. The original URL is coming from the upstream publishing-bot, I don't know where did they find that URL. It could be that it has been used in the past, but that Google has stopped updating the bucket.

/assign @xrstf

[xrstf]

/approve

[kcp-ci-bot]

LGTM label has been added.

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Git tree hash: 8d832b6fb1c1bf69a79af5ec1a75c3a93d098e67

[kcp-ci-bot]

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