[Bug]: Coverage CI fails when setup-cmake cannot download Ninja (HTTP 503)

## Is there an existing issue for the same bug?

- [x] I have checked the existing issues.

## Branch Name

main

## Commit ID

32216f2237dd2493a0915f5ad948815a21f296af

## Other Environment Information

- GitHub Actions hosted Ubuntu 22.04 runner
- Workflow: MatrixOne ALL CI
- Job: Matrixone Utils CI / Coverage

## Actual Behavior

The coverage-merge job fails before generating a diff or processing any
coverage profile. The shared CI `setup-cmake` action cannot download
`ninja-build`: it reports two `socket hang up` retries and then
`Unexpected HTTP response: 503`.

## Expected Behavior

The CI setup action should either obtain its Ninja dependency or report a
retriable infrastructure failure without making the PR coverage check fail.

## Steps to Reproduce

1. Open https://github.com/matrixorigin/matrixone/actions/runs/31614026712/job/94189005083.
2. Inspect the `Set up Go` step, which invokes the shared
`matrixorigin/CI/actions/setup-cmake@main` action.
3. Observe the Ninja download fail before `Generate diff.patch` and
`Merge profiles and check coverage rate` begin.

## Additional information

Relevant log excerpt:

```text
Download and extract ninja-build
socket hang up
Waiting 16 seconds before trying again
socket hang up
Waiting 19 seconds before trying again
Error: Unexpected HTTP response: 503
install-cmake failed
```

This is independent of PR #27058's database-CLONE changes: no project Go
source, tests, or coverage artifacts had run when the failure occurred.
The full job is linked above.