Bump oj from 3.6.11 to 3.6.12 (#8996)

Bumps [oj](https://github.com/ohler55/oj) from 3.6.11 to 3.6.12.
- [Release notes](https://github.com/ohler55/oj/releases)
- [Changelog](https://github.com/ohler55/oj/blob/master/CHANGELOG.md)
- [Commits](https://github.com/ohler55/oj/compare/v3.6.11...v3.6.12

)

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