Fix 422 error when updating release without commitish parameter #144
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When updating an existing release without providing a commitish parameter, the resource was setting TargetCommitish to an empty string, which GitHub's API rejects with a 422 "Invalid target_commitish parameter" error.
This fix mirrors the behavior of the Body field - when commitish is not specified, TargetCommitish is now set to nil instead of an empty string, allowing GitHub to preserve the existing target commit for the release.