Bump marked from 1.2.5 to 1.2.6

Bumps [marked](https://github.com/markedjs/marked) from 1.2.5 to 1.2.6.
- [Release notes](https://github.com/markedjs/marked/releases)
- [Changelog](https://github.com/markedjs/marked/blob/master/release.config.js)
- [Commits](https://github.com/markedjs/marked/compare/v1.2.5...v1.2.6

)

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