fix: Print verbose errors in cudf deps updater

[mhaseeb123]

Description

This PR updates the update-cudf-deps.sh to not silently exit without any message or effect when, for example, read fails due to GH rate limiting and throws a verbose message such as

Error: Failed to fetch VERSION file from branch main
  Try: `gh auth login` (or set GH_TOKEN) before running this script
  Create a GitHub personal access token at https://github.com/settings/tokens/new
  (Select scope: public_repo)

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[bdice]

Recently I used this approach for a “maybe curl, maybe gh” style. Might help simplify the code if you think using gh for authentication when available is sufficient, rather than taking an environment variable.

fetch_github_api() {
    local endpoint=$1
    if command -v gh &>/dev/null; then
        gh api "${endpoint}" 2>/dev/null && return
    fi
    curl -sf "https://api.github.com/${endpoint}"
}