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

Replace http.Get (no timeout) with http.NewRequestWithContext in two
call sites that can hang the CLI indefinitely if GitHub is unreachable:

- downloadKubebuilderBinary: 2-minute timeout for binary download
- fetchLatestRelease: 30-second timeout for GitHub API call

The newer helpers/download.go in the same package already uses this
pattern correctly. The timeouts match: 2 minutes for binary downloads
(same as download.go:71), 30 seconds for a single API JSON response.

Introduced in #4871 (2025-06-12).

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