GithubLatest: Use curl options in request

We can't pass curl options to `GitHub#get_latest_release`, so we have
to switch to an `#open_rest` call in `GithubLatest`. The former method
simply creates the API URL from a username and repository before
calling `#open_rest`. We already generate the same URL, so we're not
losing anything with this switch.

This maintains the existing API request but we're able to properly
use `DEFAULT_CURL_OPTIONS`, which notably ensures that the curl
command isn't printed in the middle of carefully-crafted `brew
livecheck --debug` output, among other things.

Library/Homebrew/livecheck/strategy/github_latest.rb

@@ -141,7 +141,11 @@ def self.find_versions(url:, regex: DEFAULT_REGEX, **_unused, &block)
 
           match_data[:url] = generated[:url]
 
-          release = GitHub.get_latest_release(generated[:username], generated[:repository])
+          release = GitHub::API.open_rest(
+            generated[:url],
+            request_method: :GET,
+            **Strategy::DEFAULT_CURL_OPTIONS
+          )
           versions_from_content(release, regex, &block).each do |match_text|
             match_data[:matches][match_text] = Version.new(match_text)
           end