Fix 'Complex Method' issue in scripts\check_upstream_updates.py

[CodeFactor](https://www.codefactor.io/repository/github/tonythethompson/numan-plugins) found an issue: Complex Method

It's currently on:
[scripts\check_upstream_updates.py:194-260](https://www.codefactor.io/repository/github/tonythethompson/numan-plugins/source/main/scripts/check_upstream_updates.py#L194)
Commit 6596f9738ac11223ce1e8476551336cc03ea152c