Yanqin Jin 8a1da56b96 Include 6.12.fb branch in format compatibility check (#7226)
Summary:
As title.

Pull Request resolved: https://github.com/facebook/rocksdb/pull/7226

Test Plan:
```
tools/check_format_compatible.sh
```

Reviewed By: pdillinger

Differential Revision: D23006013

Pulled By: riversand963

fbshipit-source-id: 428f29ad984691183beae72d3d3e753ec9b085a7
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