`GithubLatest` was updated to use parts of `GithubRelease` and this
works fine within `brew livecheck` (since we `require` all the
strategies) but we need to explicitly `require` `GithubRelease` in
the `GithubLatest` test file now. Without this, we encounter errors
in parts of `GithubLatest` where `GithubRelease` is referenced.
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