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fix(cli/alpha): add context timeout to HTTP calls in alpha update

Replace bare http.Get and http.Head calls with context-bounded
requests using http.NewRequestWithContext so that alpha update
never hangs when GitHub is unreachable.

Affected call sites:
- fetchLatestRelease (GET, 2 min timeout)
- downloadKubebuilderBinary (GET, 2 min timeout)
- validateBinaryAvailability (HEAD, 2 min timeout)

Signed-off-by: Sebastien Tardif <sebtardif@ncf.ca>