flatten-allof fix circular additionalProperties overflow

[tcdsv]

fix for: #523

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 83.57%. Comparing base (8dd6b42) to head (4fd6974).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #529 +/- ## ======================================= Coverage 83.56% 83.57% ======================================= Files 226 226 Lines 12964 12966 +2 ======================================= + Hits 10834 10836 +2 Misses 1714 1714 Partials 416 416 ``` | [Flag](https://app.codecov.io/gh/Tufin/oasdiff/pull/529/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Tufin) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/Tufin/oasdiff/pull/529/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Tufin) | `83.57% <100.00%> (+<0.01%)` | :arrow_up: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Tufin#carryforward-flags-in-the-pull-request-comment) to find out more.

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